Folatelli, Gaston, Phillips, M. M., Burns, Christopher R., Contreras, Carlos, Hamuy, Mario, Freedman, W. L., ...
We present the analysis of the first set of low-redshift Type Ia supernovae (SNe Ia) by the Carnegie Supernova Project. Well-sampled, high-precision optical (ugriBV) and near-infrared (NIR; YJHKs)...
Contreras, Carlos, Hamuy, Mario, Phillips, M. M., Folatelli, Gaston, Suntzeff, Nicholas B., Persson, S. E., ...
The Carnegie Supernova Project (CSP) is a five-year survey being carried out at the Las Campanas Observatory to obtain high-quality light curves of ~100 low-redshift Type Ia supernovae in a...
Walsh, Jonelle L., Minezaki, Takeo, Bentz, Misty C., Barth, Aaron J., Baliber, Nairn, Li, Weidong, ...
The Lick AGN Monitoring Project targeted 13 nearby Seyfert 1 galaxies with the intent of measuring the masses of their central black holes using reverberation mapping. The sample includes 12 galaxies...
Smith, Nathan, Miller, Adam A., Li, Weidong, Filippenko, Alexei V., Silverman, Jeffrey M., Howard, Andrew W., ...
We present progenitor star detections, light curves, and spectra of SN 2009ip and the 2009 optical transient in UGC 2773 (U2773-OT), which were not genuine supernovae (SNe). In particular, precursor...
Variable Sodium Absorption in a Low-extinction Type Ia Supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
Recent observations have revealed that some Type Ia supernovae exhibit narrow, time-variable Na I D absorption features. The origin of the absorbing material is controversial, but it may suggest the...
SN 2003bg: The First Type IIb Hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
Optical and near-infrared photometry and optical spectroscopy are reported for SN 2003bg, starting a few days after explosion and extending for a period of more than 300 days. Our early-time spectra...
Bentz, Misty C., Walsh, Jonelle L., Barth, Aaron J., Baliber, Nairn, Bennert, Nicola, Canalizo, Gabriela, ...
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 nearby (z < 0.05)...
GRB 090426: The Environment of a Rest-Frame 0.35-second Gamma-Ray Burst at Redshift z=2.609 (2009)
Levesque, Emily M., Bloom, Joshua S., Butler, Nathaniel R., Perley, Daniel A., Cenko, S. Bradley, Prochaska, J. Xavier, ...
We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst with an observed duration of 90%...
Variable Sodium Absorption in a Low-Extinction Type Ia Supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
Recent observations have revealed that some Type Ia supernovae exhibit narrow, time-variable Na I D absorption features. The origin of the absorbing material is controversial, but it may suggest the...
Ho, Luis C., Greene, Jenny E., Filippenko, Alexei V., Sargent, Wallace L. W.
We present new central stellar velocity dispersion measurements for 428 galaxies in the Palomar spectroscopic survey of bright, northern galaxies. Of these, 142 have no previously published...
Exploring the Optical Transient Sky with the Palomar Transient Factory (2009)
Rau, Arne, Kulkarni, Shrinivas R., Law, Nicholas M., Bloom, Joshua S., Ciardi, David, Djorgovski, George S., ...
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes to years. PTF uses the CFH12k mosaic camera,...
Ho, Luis C., Greene, Jenny E., Filippenko, Alexei V., Sargent, Wallace L. W.
We present new central stellar velocity dispersion measurements for 428 galaxies in the Palomar spectroscopic survey of bright, northern galaxies. Of these, 142 have no previously published...
Spectral Evolution of the Extraordinary Type IIn Supernova 2006gy (2009)
Smith, Nathan, Chornock, Ryan, Silverman, Jeffrey M., Filippenko, Alexei V., Foley, Ryan J.
We present a detailed analysis of the extremely luminous Type IIn supernova SN2006gy using spectra obtained between days 36 and 237 after explosion. We derive the temporal evolution of the effective...
Riess, Adam G., Macri, Lucas, Casertano, Stefano, Sosey, Megan, Lampeitl, Hubert, Ferguson, Henry C., ...
We report observations of 240 Cepheid variables obtained with the Near Infrared Camera (NICMOS) through the F160W filter on the Hubble Space Telescope (HST). The Cepheids are distributed across six...
Cepheid Calibrations of Modern Type Ia Supernovae:Implications for the Hubble Constant (2009)
Riess, Adam G., Macri, Lucas, Li, Weidong, Lampeitl, Hubert, Casertano, Stefano, Ferguson, Henry C., ...
This is the first of two papers reporting measurements from a program to determine the Hubble constant to 5% precision from a refurbished distance ladder. We present new observations of 110 Cepheid...
Gultekin, Kayhan, Richstone, Douglas O., Gebhardt, Karl, Lauer, Tod R., Tremaine, Scott, Aller, M. C., ...
We derive improved versions of the relations between supermassive black hole mass (M_BH) and host-galaxy bulge velocity dispersion (sigma) and luminosity (L) (the M-sigma and M-L relations), based on...
Optical Spectroscopy of the Somewhat Peculiar Type IIb Supernova 2001ig (2009)
Silverman, Jeffrey M., Mazzali, Paolo, Chornock, Ryan, Filippenko, Alexei V., Clocchiatti, Alejandro, Phillips, Mark M., ...
Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type IIb SN, from about a week after explosion until nearly one year later. The earliest spectrum consists of only a...
SN 2008ha: An Extremely Low Luminosity and Extremely Low Energy Supernova (2009)
Foley, Ryan J., Chornock, Ryan, Filippenko, Alexei V., Ganeshalingam, Mohan, Kirshner, Robert P., Li, Weidong, ...
We present ultraviolet, optical, and near-infrared photometry as well as optical spectra of the peculiar supernova (SN) 2008ha. SN 2008ha had a very low peak luminosity, reaching only M_V = -14.2...
A Quintet of Black Hole Mass Determinations (2009)
Gultekin, Kayhan, Richstone, Douglas O., Gebhardt, Karl, Lauer, Tod R., Pinkney, Jason, Aller, M. C., ...
We report five new measurements of central black hole masses based on STIS and WFPC2 observations with the Hubble Space Telescope and on axisymmetric, three-integral, Schwarzschild orbit-library...
The Chemical Abundances of Tycho G in Supernova Remnant 1572 (2009)
González Hernández, Jonay I., Ruiz-Lapuente, Pilar, Filippenko, Alexei V., Foley, Ryan J., Gal-Yam, Avishay, Simon, Joshua D.
We present an analysis of the chemical abundances of the star Tycho G in the direction of the remnant of supernova (SN) 1572, based on Keck high-resolution optical spectra. The stellar parameters of...
The chemical abundances of tycho G in supernova remnant 1572 (2009)
González Hernández, Jonay I., Ruiz-Lapuente, Pilar, Filippenko, Alexei V., Foley, Ryan J., Gal-Yam, Avishay, Simon, Joshua D.
Optical spectroscopy of the somewhat peculiar type IIb supernova 2001ig (2009)
Silverman, Jeffrey M., Mazzali, Paolo, Chornock, Ryan, Filippenko, Alexei V., Clocchiatti, Alejandro, Phillips, Mark M., ...
Variable sodium absorption in a low-extinction type Ia supernova (2009)
Simon, Joshua D., Gal-Yam, Avishay, Gnat, Orly, Quimby, Robert M., Ganeshalingam, Mohan, Silverman, Jeffrey M., ...
Supernova 2003bg: the first type IIb hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
SN 2008S: A Cool Super-Eddington Wind in a Supernova Impostor (2008)
Smith, Nathan, Ganeshalingam, Mohan, Li, Weidong, Chornock, Ryan, Steele, Thea N., Silverman, Jeffrey M., ...
We present visual-wavelength photometry and spectroscopy of SN2008S. Based on the relatively low peak luminosity for a supernova (SN) of M_R = -13.9 mag and moderate outflow speeds of \la 600 km/s...
Wang, Xiaofeng, Li, Weidong, Filippenko, Alexei V., Foley, R. J., Kirshner, R. P., Modjaz, M., ...
We present extensive photometry at ultraviolet (UV), optical, and near-infrared (NIR) wavelengths, as well as dense sampling of optical spectra, for the normal type Ia supernova (SN Ia) 2005cf. From...
Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample (2008)
Poznanski, Dovi, Butler, Nathaniel, Filippenko, Alexei V., Ganeshalingam, Mohan, Li, Weidong, Bloom, Joshua S., ...
In the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and...
First Results from the Lick AGN Monitoring Project: The Mass of the Black Hole in Arp 151 (2008)
Bentz, Misty C., Walsh, Jonelle L., Barth, Aaron J., Baliber, Nairn, Bennert, Nicola, Canalizo, Gabriela, ...
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 13 nearby (z < 0.05)...
Walsh, Jonelle L., Barth, Aaron J., Ho, Luis C., Filippenko, Alexei V., Rix, Hans-Walter, Shields, Joseph C., ...
We present Space Telescope Imaging Spectrograph observations of 14 nearby low-luminosity active galactic nuclei, including 13 LINERs and 1 Seyfert, taken at multiple parallel slit positions centered...
Smith, Nathan, Silverman, Jeffrey M., Chornock, Ryan, Filippenko, Alexei V., Wang, Xiaofeng, Li, Weidong, ...
We present optical photometry and spectroscopy of SN2005ip for the first 3yr after discovery, showing an underlying Type II-L SN interacting with a steady wind to yield an unusual Type IIn spectrum....
Physical conditions in low-luminosity active galactic nuclei (2008)
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Physical conditions in the nuclei of emission-line galaxies are investigated by...
The Chemical Abundances of Tycho G in Supernova Remnant 1572 (2008)
Hernández, Jonay I. González, Ruiz-Lapuente, Pilar, Filippenko, Alexei V., Foley, Ryan J., Gal-Yam, Avishay, Simon, Joshua D.
We present an analysis of the chemical abundances of the star Tycho G in the direction of the remnant of supernova (SN) 1572, based on Keck high-resolution optical spectra. The stellar parameters of...
A Stellar Dynamical Measurement of the Black Hole Mass in the Maser Galaxy NGC 4258 (2008)
Siopis, Christos, Gebhardt, Karl, Lauer, Tod R., Kormendy, John, Pinkney, Jason, Richstone, Douglas, ...
We determine the mass of the black hole at the center of the spiral galaxy NGC 4258 by constructing axisymmetric dynamical models of the galaxy. These models are constrained by high spatial...
Walsh, Jonelle L., Barth, Aaron J., Ho, Luis C., Filippenko, Alexei V., Rix, Hans-Walter, Shields, Joseph C., ...
(Abridged) We present STIS observations of 14 nearby low-luminosity active galactic nuclei, including 13 LINERs and 1 Seyfert, taken at multiple parallel slit positions centered on the galaxy nuclei...
The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 (2008)
Updike, Adria C., Haislip, Joshua B., Nysewander, Melissa C., Fruchter, Andrew S., Kann, D. Alexander, Klose, Sylvio, ...
We report on multi-wavelength observations, ranging from the X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption...
Smith, Nathan, Chornock, Ryan, Li, Weidong, Ganeshalingam, Mohan, Silverman, Jeffrey M., Foley, Ryan J., ...
SN2006tf is the third most luminous SN discovered so far, after SN2005ap and SN2006gy. SN2006tf is valuable because it provides a link between two regimes: (1) luminous type IIn supernovae powered by...
Luminosity Indicators in the Ultraviolet Spectra of Type Ia Supernovae (2008)
Foley, Ryan J., Filippenko, Alexei V., Jha, Saurabh W.
We present a complete sample of International Ultraviolet Explorer and Hubble Space Telescope ultraviolet (UV) spectra of Type Ia supernovae (SNe Ia) through 2004. We measure the equivalent width...
Late-Time HST Photometry of SN 1994I: Hints of Positron Annihilation Energy Deposition (2008)
Clocchiatti, Alejandro, Wheeler, J. Craig, Kirshner, Robert P., Branch, David, Challis, Peter, Chevalier, Roger A., ...
We present multicolor Hubble Space Telescope (HST) WFPC2 broadband observations of the Type Ic SN 1994I obtained approximately 280 days after maximum light. We measure the brightness of the SN and,...
First-Year Spectroscopy for the SDSS-II Supernova Survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of...
On IC 10 X-1, the Most Massive Known Stellar-Mass Black Hole (2008)
Silverman, Jeffrey M., Filippenko, Alexei V.
IC 10 X-1 is a variable X-ray source in the Local Group starburst galaxy IC 10 whose optical counterpart is a Wolf-Rayet (WR) star. Prestwich et al. (2007) recently proposed that it contains the most...
Late-time observations of SN2006gy: Still Going Strong (2008)
Smith, Nathan, Foley, Ryan J., Bloom, Joshua S., Li, Weidong, Filippenko, Alexei V., Gavazzi, Raphael, ...
Owing to its extremely high luminosity and long duration, SN2006gy radiated more energy in visual light than any other known SN. Two hypotheses to explain its high luminosity -- that it was powered...
Chemical Abundances of the Secondary Star in the Black Hole X-ray Binary XTE J1118+480 (2008)
Hernández, Jonay I. González, Rebolo, Rafael, Israelian, Garik, Filippenko, Alexei V., Chornock, Ryan, Tominaga, Nozomu, ...
Following the recent abundance measurements of Mg, Al, Ca, Fe, and Ni in the black hole X-ray binary XTE J1118+480 using medium-resolution Keck II/ESI spectra of the secondary star (Gonz\'alez...
Asphericity in Supernova Explosions from Late-Time Spectroscopy (2008)
Maeda, Keiichi, Kawabata, Koji, Mazzali, Paolo A., Tanaka, Masaomi, Valenti, Stefano, Nomoto, Ken'ichi, ...
Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspherical. One important...
The sloan digital sky survey-II supernova survey: technical summary (2008)
Frieman, Joshua A., Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, ...
Asphericity in supernova explosions from late-time spectroscopy (2008)
Maeda, Keiichi, Kawabata, Koji, Mazzali, Paolo A., Tanaka, Masaomi, Valenti, Stefano, Nomoto, Ken'ichi, ...
First-year spectroscopy for the sloan digital sky survey - II. Supernova survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
Elebert, P., Callanan, Paul J., Filippenko, Alexei V., Garnavich, Peter M., Mackie, Glen H., Hill, John M., ...
We present phase resolved optical photometry and spectroscopy of the accreting millisecond pulsar HETE J1900.1−2455. Our R-band light curves exhibit a sinusoidal modulation, at close to the...
Elebert, P., Callanan, Paul J., Filippenko, Alexei V., Garnavich, Peter M., Mackie, Glen H., Hill, John M., ...
We present phase resolved optical photometry and spectroscopy of the accreting millisecond pulsar HETE J1900.1−2455. Our R-band light curves exhibit a sinusoidal modulation, at close to the...
Elebert, P., Callanan, Paul J., Filippenko, Alexei V., Garnavich, Peter M., Mackie, Glen H., Hill, John M., ...
We present phase resolved optical photometry and spectroscopy of the accreting millisecond pulsar HETE J1900.1−2455. Our R-band light curves exhibit a sinusoidal modulation, at close to the...
Elebert, P., Callanan, Paul J., Filippenko, Alexei V., Garnavich, Peter M., Mackie, Glen H., Hill, John M., ...
We present phase resolved optical photometry and spectroscopy of the accreting millisecond pulsar HETE J1900.1−2455. Our R-band light curves exhibit a sinusoidal modulation, at close to the...
Walsh, Jonelle L., Barth, Aaron J., Ho, Luis C., Filippenko, Alexei V., Rix, Hans-Walter, Shields, Joseph C., ...
We present Space Telescope Imaging Spectrograph observations of 14 nearby low-luminosity active galactic nuclei, including 13 LINERs and 1 Seyfert, taken at multiple parallel slit positions centered...
Elebert, P., Callanan, Paul J., Filippenko, Alexei V., Garnavich, Peter M., Mackie, Glen H., Hill, John M., ...
We present phase resolved optical photometry and spectroscopy of the accreting millisecond pulsar HETE J1900.1−2455. Our R-band light curves exhibit a sinusoidal modulation, at close to the...
Saurabh Jha, Peter M. Garnavich, Robert P. Kirshner, Peter Challis, Alicia M. Soderberg, Lucas M. Macri, ...
We present optical and near-infrared photometry and spectroscopy of the Type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29...
The Detection of a Light Echo from the Type Ia Supernova 2006X in M100 (2007)
Wang, Xiaofeng, Li, Weidong, Filippenko, Alexei V., Foley, Ryan J., Smith, Nathan, Wang, Lifan
We report the discovery of a light echo (LE) from the Type Ia supernova (SN) 2006X in the nearby galaxy M100. The presence of the LE is supported by analysis of both the Advanced Camera for Surveys...
Gal-Yam, Avishay, Maoz, Dan, Guhathakurta, Puragra, Filippenko, Alexei V.
We describe the Wise Observatory Optical Transient Search (WOOTS), a survey for supernovae (SNe) and other variable and transient objects in the fields of redshift 0.06-0.2 Abell galaxy clusters. We...
The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg (2007)
Hoffman, Jennifer L., Leonard, Douglas C., Chornock, Ryan, Filippenko, Alexei V., Barth, Aaron J., Matheson, Thomas
We present multi-epoch spectral and spectropolarimetric observations of the Type IIn supernova (SN) 1997eg that indicate the presence of a flattened disk-like concentration of circumstellar material...
Constraints on Circumstellar Material Around the Type Ia Supernova 2007af (2007)
Simon, Joshua D., Gal-Yam, Avishay, Penprase, Bryan E., Li, Weidong, Quimby, Robert M., Silverman, Jeffrey M., ...
Patat et al. recently inferred the existence of circumstellar material around a normal Type Ia supernova (SN) for the first time, finding time-variable Na I D absorption lines in the spectrum of SN...
Wang, Xiaofeng, Li, Weidong, Filippenko, Alexei V., Krisciunas, Kevin, Suntzeff, Nicholas B., Li, Junzheng, ...
We present extensive optical (UBVRI), near-infrared (JK) light curves and optical spectroscopy of the Type Ia supernova (SN) 2006X in the nearby galaxy NGC 4321 (M100). Our observations suggest that...
Supernovae in the Subaru Deep Field: An Initial Sample, and Type Ia Rate, out to Redshift 1.6 (2007)
Poznanski, Dovi, Maoz, Dan, Yasuda, Naoki, Foley, Ryan J., Doi, Mamoru, Filippenko, Alexei V., ...
Large samples of high-redshift supernovae (SNe) are potentially powerful probes of cosmic star formation, metal enrichment, and SN physics. We present initial results from a new deep SN survey, based...
Gerardy, Christopher L., Meikle, W. P. S., Kotak, Rubina, Höflich, Peter, Farrah, Duncan, Filippenko, Alexei V., ...
We present mid-infrared (5.2-15.2 μm) spectra of the Type Ia supernovae (SNe Ia) 2003hv and 2005df observed with the Spitzer Space Telescope. These are the first observed mid-infrared spectra of...
SubmilliJansky Transients in Archival Radio Observations (2007)
Bower, Geoffrey C., Saul, Destry, Bloom, Joshua S., Bolatto, Alberto, Filippenko, Alexei V., Foley, Ryan J., ...
[ABRIDGED] We report the results of a 944-epoch survey for transient sources with archival data from the Very Large Array spanning 22 years with a typical epoch separation of 7 days. Observations...
Smith, Nathan, Foley, Ryan J., Filippenko, Alexei V.
We present evidence for the formation of dust grains in an unusual Type Ib SN based on late-time spectra of SN 2006jc. The progenitor suffered an LBV-like outburst just 2 yr earlier, and we propose...
Keck and ESO-VLT View of the Symmetry of the Ejecta of the XRF/SN 2006aj (2007)
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Nebular-phase spectra of SN 2006aj, which was discovered in coincidence with X-ray flash 060218, were obtained with Keck in 2006 July and the Very Large Telescope in 2006 September. At the latter...
On the Progenitor of SN 2005gl and the Nature of Type IIn Supernovae (2007)
Gal-Yam, Avishay, Leonard, D. C., Fox, D. B., Cenko, S. B., Soderberg, A. M., ...
We present a study of the Type IIn supernova (SN) 2005gl, in the relatively nearby (d ≈ 66 Mpc) galaxy NGC 266. Photometry and spectroscopy of the SN indicate that it is a typical member of its...
Gerardy, Christopher L., Meikle, W. P. S., Kotak, Rubina, Hoeflich, Peter, Farrah, Duncan, Filippenko, Alexei V., ...
We present the first mid-infrared (5.2-15.2 micron) spectra of Type Ia supernovae (SNe 2003hv and 2005df). The detection of Ni emission in SN 2005df 135 days after the explosion provides direct...
Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf (2007)
Parrent, Jerod, Branch, David, Troxel, M. A., Casebeer, D., Jeffery, David J., Ketchum, W., ...
Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to spectra of the unusual Type Ib supernova 2005bf. We confirm the discovery by Folatelli et...
On the Progenitors of Two Type II-P Supernovae in the Virgo Cluster (2007)
Li, Weidong, Wang, Xiaofeng, Van Dyk, Schuyler D., Cuillandre, Jean-Charles, Foley, Ryan J., Filippenko, Alexei V.
Direct identification of the progenitors of supernovae (SNe) is rare because of the required spatial resolution and depth of the archival data prior to the SN explosions. Here we report on the...
The peculiar SN 2005hk: Do some type Ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prieto, José L., ...
Mazzali, Paolo A., Foley, Ryan J., Deng, Jinsong, Patat, Ferdinando, Pian, Elena, Baade, Dietrich, ...
Shields, Joseph C., Rix, Hans-Walter, Sarzi, Marc, Barth, Aaron J., Filippenko, Alexei V., Ho, Luis C., ...
We present results from a program of optical spectroscopy for 23 nearby galaxies with emission-line nuclei. This investigation takes advantage of the spatial resolution of the Hubble Space Telescope...
The peculiar SN 2005hk: Do some type ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prietro, Jose L., ...
Publicación ISI
The peculiar SN 2005hk: Do some type ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prietro, Jose L., ...
Publicación ISI
SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium (2006)
Foley, Ryan J., Smith, Nathan, Ganeshalingam, Mohan, Li, Weidong, Chornock, Ryan, Filippenko, Alexei V.
We present optical photometry and spectra of the peculiar Type Ib supernova (SN) 2006jc. Strong and relatively narrow He I emission lines indicate the progenitor star exploded inside a dense...
Smith, Nathan, Li, Weidong, Foley, Ryan J., Wheeler, J. Craig, Pooley, Dave, Chornock, Ryan, ...
(abridged) We report our discovery and observations of the peculiar Type IIn supernova SN2006gy in NGC1260, revealing that it reached a peak magnitude of -22, making it the most luminous supernova...
Riess, Adam G., Strolger, Louis-Gregory, Casertano, Stefano, Ferguson, Henry C., Mobasher, Bahram, Gold, Ben, ...
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion years. These objects,...
Keck Infrared Observations of GRO J0422+32 in Quiescence (2006)
Reynolds, Mark T., Callanan, Paul J., Filippenko, Alexei V.
We present Keck K-band photometry and low-resolution H & K-band spectroscopy of the X-ray nova GRO J0422+32 obtained while the system was in the quiescent state. No clear ellipsoidal modulation is...
Supernovae in Low-Redshift Galaxy Clusters: the Type-Ia Supernova Rate (2006)
Sharon, Keren, Gal-Yam, Avishay, Maoz, Dan, Filippenko, Alexei V., GuhaThakurta, Puragra
Supernova (SN) rates are a potentially powerful diagnostic of star formation history (SFH), metal enrichment, and SN physics, particularly in galaxy clusters with their deep, metal-retaining...
The Centers of Early-Type Galaxies with HST. VI. Bimodal Central Surface Brightness Profiles (2006)
Lauer, Tod R., Gebhardt, Karl, Faber, S. M., Richstone, Douglas, Tremaine, Scott, Kormendy, John, ...
We combine the results from several HST investigations of the central structure of early-type galaxies to generate a large sample of parameterized surface photometry. The studies included were those...
Spitzer measurements of atomic and molecular abundances in the Type IIP SN 2005af (2006)
Kotak, Rubina, Meikle, Peter, Pozzo, Monica, Van Dyk, Schuyler D., Farrah, Duncan, Fesen, Robert, ...
We present results based on Spitzer Space Telescope mid-infrared (3.6-30 micron) observations of the nearby IIP supernova 2005af. We report the first ever detection of the SiO molecule in a Type IIP...
Deviations From Axisymmetry Revealed by Line Polarization in the Normal Type Ia SN 2004S (2006)
Chornock, Ryan, Filippenko, Alexei V.
We present a single epoch of high signal-to-noise ratio spectropolarimetry of the Type Ia supernova (SN Ia) 2004S taken nine days after maximum light. The flux spectrum is normal, but with the...
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts (2006)
Folatelli, Gaston, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology,...
Lauer, Tod R., Faber, S. M., Richstone, Douglas, Gebhardt, Karl, Tremaine, Scott, Postman, Marc, ...
Black hole masses predicted from the Mbh-sigma relationship conflict with those predicted from the Mbh-L relationship for the most luminous galaxies, such as brightest cluster galaxies (BCGs). This...
Desroches, Louis-Benoit, Filippenko, Alexei V., Kaspi, Shai, Laor, Ari, Maoz, Dan, Ganeshalingam, Mohan, ...
We present optical observations of the low-luminosity Seyfert 1 nucleus of NGC 4395, as part of a multiwavelength reverberation-mapping program. Observations were carried out over two nights in 2004...
XTE J1118+480: A Metal-Rich Black Hole Binary in the Galactic Halo (2006)
Hernandez, Jonay I. Gonzalez, Rebolo, Rafael, Israelian, Garik, Harlaftis, Emilios T., Filippenko, Alexei V., Chornock, Ryan
We present medium-resolution optical spectra of the secondary star in the high Galactic latitude black hole X-ray binary XTE J1118+480 and determine the abundance of Mg, Al, Ca, Fe, and Ni in its...
Sn 2005bf: A possible transition event between type Ib/c supernovae and gamma-ray bursts (2006)
Folatelli, Gastón, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first similar to 100 days following discovery. The u'g'BV light curves displayed an unprecedented...
A neutron-star-driven X-ray flash associated with supernova SN 2006aj (2006)
Mazzali, Paolo A., Deng, Jinsong, Nomoto, Ken'ichi, Sauer, Daniel N., Pian, Elena, Tominaga, Nozomu, ...
Supernovae connected with long-duration gamma-ray bursts (GRBs) are hyper-energetic explosion resulting from the collapse of very massive stars (about 40Mo, where Mo is the mass of the Sun) stripped...
O'Neill, Paul M., Kaspi, Shai, Laor, Ari, Nandra, Kirpal, Moran, Edward C., Peterson, Bradley M., ...
We report on two Chandra observations, and a simultaneous Hubble Space Telescope ultraviolet observation, of the dwarf Seyfert 1 galaxy NGC 4395. Each Chandra observation had a duration of ~30 ks,...
A non-spherical core in the explosion of supernova SN 2004dj (2006)
Leonard, Douglas C., Filippenko, Alexei V., Ganeshalingam, Mohan, Serduke, Franklin J. D., Li, Weidong, Swift, Brandon J., ...
An important and perhaps critical clue to the mechanism driving the explosion of massive stars as supernovae is provided by the accumulating evidence for asymmetry in the explosion. Indirect evidence...
Spectropolarimetry of the Peculiar Type Ia SN 2005hk (2006)
Chornock, Ryan, Filippenko, Alexei V., Branch, David, Foley, Ryan J., Jha, Saurabh, Li, Weidong
We present Keck spectropolarimetry of the unusual type Ia supernova (SN Ia) 2005hk several days before maximum light. An analysis of the high signal-to-noise-ratio total-flux spectrum shows the...
The Type IIn Supernova 2002kg: The Outburst of a Luminous Blue Variable Star in NGC 2403 (2006)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V., Humphreys, Roberta M., Chornock, Ryan, Foley, Ryan, ...
We show that Supernova (SN) 2002kg in NGC 2403, initially classified as Type II-narrow (IIn), has photometric and spectroscopic properties unlike those of normal SNe. Its behavior, instead, is more...
Late-Time Spectroscopy of SN 2002cx: The Prototype of a New Subclass of Type Ia Supernovae (2006)
Jha, Saurabh, Branch, David, Chornock, Ryan, Foley, Ryan J., Li, Weidong, Swift, Brandon J., ...
We present Keck optical spectra of SN 2002cx, the most peculiar known Type Ia supernova (SN Ia), taken 227 and 277 days past maximum light. Astonishingly, the spectra are not dominated by the...
The Carnegie Supernova Project: The low-redshift survey (2006)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
SN 2005bf: a possible transition event between type Ib/c supernovae and gamma-ray bursts (2006)
Folatelli, Gastón, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
A neutron-star-driven X-ray flash associated with supernova SN 2006aj (2006)
Mazzali, Paolo A., Deng, Jinsong, Nomoto, Ken'ichi, Sauer, Daniel N., Pian, Elena, Tominaga, Nozomu, ...
Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts (2006)
Blondin, Stéphane, Dessart, Luc, Leibundgut, Bruno, Branch, David, Höflich, Peter, Tonry, John L., ...
Using archival data of low-redshift (z < 0.01; Center for Astrophysics and SUSPECT databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16 < z < 0.64) SNe Ia, we study...
Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts (2006)
Blondin, Stéphane, Dessart, Luc, Leibundgut, Bruno, Branch, David, Höflich, Peter, Tonry, John L., ...
Using archival data of low-redshift (z < 0.01; Center for Astrophysics and SUSPECT databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16 < z < 0.64) SNe Ia, we study...
Clocchiatti, Alejandro, Schmidt, Brian P., Filippenko, Alexei V., Challis, Peter, Coil, Alison L., Covarrubias, R., ...
We present observations of the Type I Supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshiftz z ≈ 0.5. They were discovered in early 1999 with the 4.0 m Blanco telescope at Cerro...
Clocchiatti, Alejandro, Schmidt, Brian P., Filippenko, Alexei V., Challis, Peter, Coil, Alison L., Covarrubias, R., ...
We present observations of the Type I Supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshiftz z ≈ 0.5. They were discovered in early 1999 with the 4.0 m Blanco telescope at Cerro...
The Carnegie Supernova Project: The Low-Redshift Survey (2005)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the Universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts (2005)
Folatelli, Gaston, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology,...
Laor, Ari, Barth, Aaron J., Ho, Luis C., Filippenko, Alexei V.
The origin and configuration of the gas which emits broad lines in Type I active galactic nuclei is not established yet. The lack of small-scale structure in the broad emission-line profiles is...
The Light Echo Around Supernova 2003gd in Messier 74 (2005)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
We confirm the discovery of a light echo around the Type II-plateau Supernova 2003gd in Messier 74 (NGC 628), seen in images obtained with the High Resolution Channel of the Advanced Camera for...
Gal-Yam, Avishay, Ofek, Eran O., Poznanski, Dovi, Levinson, Amir, Waxman, Eli, Frail, Dale A., ...
We had previously reported on a survey for radio transients, used to set an upper limit on the number of orphan gamma-ray burst (GRB) radio afterglows, and thus a lower limit on the typical GRB...
Li, Weidong, Van Dyk, Schuyler D., Filippenko, Alexei V., Cuillandre, Jean-Charles, Jha, Saurabh, Bloom, Joshua S., ...
The stars that end their lives as supernovae (SNe) have been directly observed in only a handful of cases, due mainly to the extreme difficulty in identifying them in images obtained prior to the SN...
Peterson, Bradley M., Bentz, Misty C., Desroches, Louis-Benoit, Filippenko, Alexei V., Ho, Luis C., Kaspi, Shai, ...
A reverberation-mapping program on NGC 4395, the least-luminous known Seyfert 1 galaxy, undertaken with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, yields a measurement of...
Evidence for Spectropolarimetric Diversity in Type Ia Supernovae (2005)
Leonard, Douglas C., Li, Weidong, Filippenko, Alexei V., Foley, Ryan J., Chornock, Ryan
We present single-epoch, post-maximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhibit unusually...
Interstellar Polarization and the Position Angle Orientations of Seyfert 1 Galaxies (2005)
Hoffman, Jennifer L., Chornock, Ryan, Leonard, Douglas C., Filippenko, Alexei V.
We comment on recent spectropolarimetric studies that compare the observed polarization position angles (PAs) of Seyfert 1 galaxies near H alpha with the observed orientations of their radio source...
The Calibration of the Swift/UVOT Optical Observations: A Recipe for Photometry (2005)
Li, Weidong, Jha, Saurabh, Filippenko, Alexei V., Bloom, Joshua S., Pooley, David, Foley, Ryan J., ...
Swift/UVOT has the capability to provide critical insight into the physics of the early afterglows of gamma-ray bursts (GRBs). But without precise calibration of the UVOT to standard photometric...
Classifications of the Host Galaxies of Supernovae, Set III (2005)
Bergh, Sidney Van Den, Li, Weidong, Filippenko, Alexei V.
A homogeneous sample comprising host galaxies of 604 recent supernovae, including 212 objects discovered primarily in 2003 and 2004, has been classified on the David Dunlap Observatory system. Most...
Riess, Adam G., Li, Weidong, Stetson, Peter B., Filippenko, Alexei V., Jha, Saurabh, Kirshner, Robert P., ...
We report observations of two nearby Type Ia supernovae (SNe Ia) for which observations of Cepheid variables in the host galaxies have been obtained with the Hubble Space Telescope: SN 1994ae in NGC...
Extreme X-ray Behavior of the Low-Luminosity Active Nucleus in NGC 4395 (2005)
Moran, Edward C., Eracleous, Michael, Leighly, Karen M., Chartas, George, Filippenko, Alexei V., Ho, Luis C., ...
We present the results of a 17 ks Chandra ACIS-S observation of the nearby dwarf spiral galaxy NGC 4395. Chandra affords the first high-quality, broadband X-ray detection of the active nucleus of...
Fruscione, Antonella, Greenhill, Lincoln J., Filippenko, Alexei V., Moran, James M., Herrnstein, James R., Galle, Elizabeth
We report monitoring of the 0.3-10 keV spectrum of NGC4258 with XMM over 1.5 years.We als o report reprocessing of an overlapping series of archival Chandra observations. By including earlier ASCA...
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts (2005)
Folatelli, Gaston, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology,...
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts (2005)
Folatelli, Gaston, Contreras, Carlos, Phillips, M. M., Woosley, S. E., Blinnikov, Sergei, Morrell, Nidia, ...
We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology,...
An asymmetric energetic type Ic supernova viewed off-axis, and a link to gamma ray bursts (2005)
Mazzali, Paolo A., Kawabata, Koji S., Maeda, Keiichi, Nomoto, Ken'ichi, Filippenko, Alexei V., Ramirez-Ruiz, Enrico, ...
The stellar populations in the central parsecs of galactic bulges (2005)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Ho, Luis C., Barth, Aaron J., Rudnick, Gregory, ...
The disappearing act of KH 15D: Photometric results from 1995 to 2004 (2005)
Hamilton, Catrina M., Herbst, William, Vrba, Frederick J., Ibrahimov, Mansur A., Mundt, Reinhard, ...
We present results from the most recent (2002-2004) observing campaigns of the eclipsing system KH 15D, in addition to rereduced data obtained at Van Vleck Observatory (VVO) between 1995 and 2000....
The stellar populations in the central Parsecs of galactic bulges (2005)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Ho, Luis C., Barth, Aaron J., Rudnick, Gregory, ...
We present Hubble Space Telescope blue spectra at intermediate spectral resolution for the nuclei of 23 nearby disk galaxies. These objects were selected to have nebular emission in their nuclei and...
On the Progenitor of the Type II Supernova 2004et in NGC 6946 (2004)
Li, Weidong, Van Dyk, Schuyler D., Filippenko, Alexei V., Cuillandre, Jean-Charles
Supernova (SN) 2004et is the eighth historical SN in the nearby spiral galaxy NGC 6946. Here we report on early photometric and spectroscopic monitoring of this object. SN 2004et is a Type II event,...
Supernovae and Their Massive Star Progenitors (2004)
I briefly describe the Lick Observatory Supernova Search with the 0.76-m Katzman Automatic Imaging Telescope. I then present an overview of optical observations of Type II, IIb, Ib, and Ic supernovae...
The Centers of Early-Type Galaxies with HST. V. New WFPC2 Photometry (2004)
Lauer, Tod R., Faber, S. M., Gebhardt, Karl, Richstone, Douglas, Tremaine, Scott, Ajhar, Edward A., ...
We analyze HST+WFPC2 images of 77 early-type galaxies. Brightness profiles are classed into "core" or "power-law" forms. Cores are typically rounder than power-law galaxies. Nearly all power-laws...
The binary progenitor of Tycho Brahe's 1572 supernova (2004)
Ruiz-Lapuente, Pilar, Comeron, Fernando, Mendez, Javier, Canal, Ramon, Smartt, Stephen J., Filippenko, Alexei V., ...
The brightness of type Ia supernovae, and their homogeneity as a class, makes them powerful tools in cosmology, yet little is known about the progenitor systems of these explosions. They are thought...
Type Ia Supernovae and Cosmology (2004)
I discuss the use of Type Ia supernovae (SNe Ia) for cosmological distance determinations. Low-redshift SNe Ia (z < 0.1) demonstrate that the Hubble expansion is linear with H_0 = 72 +/- 8 km/s/Mpc,...
Shields, Joseph C., Rix, Hans-Walter, Sarzi, Marc, Barth, Aaron J., Filippenko, Alexei V., Ho, Luis C., ...
We present results from a program of optical spectroscopy for 23 nearby galaxy emission-line nuclei. This investigation takes advantage of the spatial resolution of the Hubble Space Telescope to...
The Stellar Populations in the Central Parsecs of Galactic Bulges Central Stellar Populations (2004)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Ho, Luis C., Barth, Aaron J., Rudnick, Gregory, ...
We present Hubble Space Telescope blue spectra at intermediate spectral resolution for the nuclei of 23 nearby disk galaxies. These objects were selected to have nebular emission in their nuclei, and...
Spectropolarimetry of Core-Collapse Supernovae (2004)
Leonard, Douglas C., Filippenko, Alexei V.
We briefly review the young field of spectropolarimetry of core-collapse supernovae (SNe). Spectropolarimetry provides the only direct known probe of early-time supernova (SN) geometry. The...
Fransson, Claes, Challis, Peter M., Chevalier, Roger A., Filippenko, Alexei V., Kirshner, Robert P., Kozma, Cecilia, ...
Ground-based and Hubble Space Telescope observations are presented for SN 1993J and SN 1998S. SN 1998S shows strong, relatively narrow circumstellar emission lines of N III-V and C III-IV, as well as...
The late-time light curve of the Type Ia supernova 2000cx (2004)
Sollerman, Jesper, Lindahl, Jan, Kozma, Cecilia, Challis, Peter, Filippenko, Alexei V., Fransson, Claes, ...
We have conducted a systematic and comprehensive monitoring programme of the Type Ia supernova 2000cx at late phases using the VLT and HST. The VLT observations cover phases 360 to 480 days past...
Reading the Spectra of the Most Peculiar Type Ia Supernova 2002cx (2004)
Branch, David, Baron, E., Thomas, R. C., Kasen, D., Li, Weidong, Filippenko, Alexei V.
In spite of the apparent lack of Si II and S II features in its spectra, SN 2002cx was classified as a peculiar Type Ia supernova (SN Ia) on the basis of its overall photometric and spectroscopic...
The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope (2004)
Chugai, Nikolai N., Blinnikov, Sergei I., Cumming, Robert J., Lundqvist, Peter, Bragaglia, Angela, Filippenko, Alexei V., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 203 days after explosion. During the luminous phase (first 100 d) the line profiles are composed of three major...
Photometric Identification of Young Stripped-Core Supernovae (2004)
Gal-Yam, Avishay, Poznanski, Dovi, Maoz, Dan, Filippenko, Alexei V., Foley, Ryan J.
We present a method designed to identify the spectral type of young (less than ~30 days after explosion) and nearby (z < ~0.05) supernovae (SNe) using their broad-band colors. In particular, we show...
Black Hole Mass Determinations From Orbit Superposition Models are Reliable (2004)
Richstone, Douglas, Gebhardt, Karl, Aller, Monique, Bender, Ralf, Bower, Gary, Dressler, Alan, ...
We show that orbit-superposition dynamical models (Schwarzschild's method) provide reliable estimates of nuclear black hole masses and errors when constructed from adequate orbit libraries and...
Riess, Adam G., Strolger, Louis-Gregory, Tonry, John, Casertano, Stefano, Ferguson, Henry C., Mobasher, Bahram, ...
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to provide the first conclusive evidence for cosmic deceleration that preceded the current...
The binary progenitor of Tycho Brahe's 1572 supernova (2004)
Ruiz-Lapuente, Pilar, Comeron, Fernado, Méndez, Javier, Canal, Ramon, Smartt, Stephen J., Filippenko, Alexei V., ...
Spectropolarimetric Observations of Supernovae (2003)
Filippenko, Alexei V., Leonard, Douglas C.
We briefly review the existing database of supernova spectropolarimetry, concentrating on recent data and on results from our group's research. Spectropolarimetry provides the only direct known probe...
Observations of Type Ia Supernovae, and Challenges for Cosmology (2003)
Li, Weidong, Filippenko, Alexei V.
Observations of Type Ia supernovae (SNe Ia) reveal correlations between their luminosities and light-curve shapes, and between their spectral sequence and photometric sequence. Assuming SNe Ia do not...
Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae (2003)
Williams, Benjamin F., Hogan, Craig J., Barris, Brian, Candia, Pablo, Challis, Peter, Clocchiatti, Alejandro, ...
We present the results of a study of the host galaxies of high redshift Type Ia supernovae (SNe Ia). We provide a catalog of 18 hosts of SNe Ia observed with the Hubble Space Telescope (HST) by the...
Optical, Ultraviolet, and Infrared Observations of SN 1993J (2003)
Filippenko, Alexei V., Matheson, Thomas
We review the existing set of optical/UV/IR observations of Supernova 1993J, concentrating heavily on optical data because these are by far the most plentiful. Some results from theoretical modeling...
SN 1994W: evidence of explosive mass ejection a few years before explosion (2003)
Chugai, Nikolai N., Cumming, Robert J., Blinnikov, Sergei I., Lundqvist, Peter, Filippenko, Alexei V., Barth, Aaron J., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 202 days after explosion. During the first 100 days the line profiles are composed of three major components:...
Using Multi-Band Photometry to Classify Supernovae (2003)
Poznanski, Dovi, Gal-Yam, Avishay, Maoz, Dan, Filippenko, Alexei V., Leonard, Douglas C., Matheson, Thomas
Large numbers of supernovae (SNe) have been discovered in recent years, and many more will be found in the near future. Once discovered, further study of a SN and its possible use as an astronomical...
Riess, Adam G., Strolger, Louis-Gregory, Tonry, John, Tsvetanov, Zlatan, Casertano, Stefano, Ferguson, Henry C., ...
We present discoveries of SNe Ia at z > 1 and the photometric diagnostic used to discriminate them from other types of SNe detected during the GOODS Hubble Space Telescope Treasury program with the...
Classifications of the Host Galaxies of Supernovae, Set II (2003)
Bergh, Sidney Van Den, Li, Weidong, Filippenko, Alexei V.
Classifications on the DDO system are given for an additional 231 host galaxies of supernovae that have been discovered during the course of the Lick Observatory Supernova Search with the Katzman...
Optical Spectra and Light Curves of Supernovae (2003)
I review recent optical observations of supernovae (SNe) conducted by my group. The Lick Observatory Supernova Search with the 0.76-m Katzman Automatic Imaging Telescope is currently the world's most...
Evidence from Type Ia Supernovae for an Accelerating Universe and Dark Energy (2003)
I review the use of Type Ia supernovae (SNe Ia) for cosmological distance determinations. Low-redshift SNe Ia (z 0. Most recently, analyses of SNe Ia at z = 1.0 - 1.7 provide further support for...
Optical Photometry and Spectroscopy of the SN 1998bw-like Type Ic Supernova 2002ap (2003)
Foley, Ryan J., Papenkova, Marina S., Swift, Brandon J., Filippenko, Alexei V., Li, Weidong, Mazzali, Paolo A., ...
We present optical photometric and spectral data of the peculiar Type Ic SN 2002ap. Photometric coverage includes UBVRI bands from 2002 January 30, the day after discovery, through 2002 December 12....
LINERs and their Physical Mechanisms (2003)
I review the basic properties of low-ionization nuclear emission-line regions (LINERs), as well as the main ionization mechanisms thus far proposed for them. There is substantial heterogeneity among...
Kinematics of Ten Early-Type Galaxies from HST and Ground-Based Spectroscopy (2003)
Pinkney, Jason, Gebhardt, Karl, Bender, Ralf, Bower, Gary, Dressler, Alan, Faber, S. M., ...
We present stellar kinematics for a sample of 10 early-type galaxies observed using the STIS aboard the Hubble Space Telescope, and the Modular Spectrograph on the MDM Observatory 2.4-m telescope....
Li, Weidong, Filippenko, Alexei V., Chornock, Ryan, Jha, Saurabh
We present the technical details of the gamma-ray burst (GRB) alert system of the Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory, and the successful observations of the GRB 020813...
Cosmological Results from High-z Supernovae (2003)
Tonry, John L., Schmidt, Brian P., Barris, Brian, Candia, Pablo, Challis, Peter, Clocchiatti, Alejandro, ...
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm the result of Riess et al. (1998a) and...
GRB 021004: A Possible Shell Nebula around a Wolf-Rayet Star Gamma-Ray Burst Progenitor (2003)
Mirabal, N., Halpern, J. P., Chornock, Ryan, Filippenko, Alexei V., Terndrup, D. M., Armstrong, E., ...
The rapid localization of GRB 021004 by the HETE-2 satellite allowed nearly continuous monitoring of its early optical afterglow decay, as well as high-quality optical spectra that determined a...
A Low-Mass Central Black Hole in the Bulgeless Seyfert 1 Galaxy NGC 4395 (2003)
Filippenko, Alexei V., Ho, Luis C.
NGC 4395 is one of the least luminous and nearest known type 1 Seyfert galaxies, and it also lacks a bulge. We present an HST I-band image of its nuclear region and Keck high-resolution (8 km/s)...
On the Geometry of the High-Velocity Ejecta of the Peculiar Type Ia Supernova 2000cx (2003)
Thomas, R. C., Branch, David, Baron, E., Nomoto, Ken'ichi, Li, Weidong, Filippenko, Alexei V.
High-velocity features in Type Ia supernova spectra provide a way to probe the outer layers of these explosions. The maximum-light spectra of the unique Type Ia supernova 2000cx exhibit interesting...
The Early Light Curve of the Optical Afterglow of GRB 021211 (2003)
Li, Weidong, Filippenko, Alexei V., Chornock, Ryan, Jha, Saurabh
The Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory observed GRB 021211 starting 105 s after the burst, among the earliest observations of an optical afterglow to date. Our...
SN 2002cx: The Most Peculiar Known Type Ia Supernova (2003)
Li, Weidong, Filippenko, Alexei V., Chornock, Ryan, Berger, Edo, Berlind, Perry, Calkins, Michael L., ...
We present photometric and spectroscopic observations of supernova (SN) 2002cx, which reveal it to be unique among all observed type Ia supernovae (SNe Ia). SN 2002cx exhibits a SN 1991T-like...
On the Progenitor of Supernova 2001du in NGC 1365 (2003)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
Hubble Space Telescope (HST) WFPC2 archival images obtained years prior to the explosion of the Type II-plateau supernova (SN) 2001du in NGC 1365 previously have been analyzed to isolate the...
Axisymmetric Dynamical Models Of The Central Regions Of Galaxies (2003)
Karl Gebhardt, Douglas Richstone, Scott Tremaine, Tod R. Lauer, Ralf Bender, Alan Dressler, ...
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect a central black...
Jason Pinkney, Karl Gebhardt, Ralf Bender, Alan Dressler, S. M. Faber, Alexei V. Filippenko, ...
We present stellar kinematics for a sample of 10 early-type galaxies observed using the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope, and the Modular Spectrograph on...
A Population of Intergalactic Supernovae in Galaxy Clusters (2002)
Gal-Yam, Avishay, Maoz, Dan, Guhathakurta, Puragra, Filippenko, Alexei V.
We have discovered seven type Ia cluster supernovae (SNe) in the course of the Wise Observatory Optical Transients Search in the fields of galaxy clusters with redshifts between z=0.06 and z=0.2. Two...
A Search for Core-Collapse Supernova Progenitors In Hubble Space Telescope Images (2002)
Van Dyk, Schuyler D., Li, Weidong, Filippenko, Alexei V.
Identifying the massive progenitor stars that give rise to core-collapse supernovae (SNe) is one of the main pursuits of supernova and stellar evolution studies. Using ground-based images of recent,...
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
We use the database from Paper III to quantify the global and nuclear properties of emission-line nuclei in the Palomar spectroscopic survey of nearby galaxies. We show that the host galaxies of...
Axisymmetric Dynamical Models of the Central Regions of Galaxies (2002)
Gebhardt, Karl, Richstone, Douglas, Tremaine, Scott, Lauer, Tod R., Bender, Ralf, Bower, Gary, ...
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect a central black...
Evidence for Extremely High Dust Polarization Efficiency in NGC 3184 (2002)
Leonard, Douglas C., Filippenko, Alexei V., Chornock, Ryan, Li, Weidong
Recent studies have found the Type II-plateau supernova (SN) 1999gi to be highly polarized (p_max = 5.8%, where p_max is the highest degree of polarization measured in the optical bandpass; Leonard &...
Leonard, Douglas C., Filippenko, Alexei V., Li, Weidong, Matheson, Thomas, Kirshner, Robert P., Chornock, Ryan, ...
We present optical spectra and photometry sampling the first six months after discovery of supernova (SN) 1999gi in NGC 3184. SN 1999gi is shown to be a Type II-plateau event with a photometric...
The magnification of SN 1997ff, the farthest known Supernova (2002)
Benitez, Narciso, Riess, Adam G., Nugent, Peter E., Dickinson, Mark, Chornock, Ryan, Filippenko, Alexei V.
With a redshift of z~1.7, SN 1997ff is the most distant type Ia supernova discovered so far. This SN is close to several bright, z=0.6-0.9 galaxies, and we consider the effects of lensing by those...
Leonard, Douglas C., Filippenko, Alexei V., Chornock, Ryan, Foley, Ryan J.
The early-time optical spectrum of the Type Ic supernova (SN) 2002ap was characterized by unusually broad features, leading some authors to designate it a "hypernova." We present optical...
Galaxies with a Central Minimum in Stellar Luminosity Density (2002)
Lauer, Tod R., Gebhardt, Karl, Richstone, Douglas, Tremaine, Scott, Bender, Ralf, Bower, Gary, ...
We used HST WFPC2 images to identify six early-type galaxies with surface- brightness profiles that decrease inward over a limited range of radii near their centers. The implied luminosity density...
Classifications of the Host Galaxies of Supernovae (2002)
Bergh, Sidney Van Den, Li, Weidong, Filippenko, Alexei V.
Classifications on the DDO system are given for the host galaxies of 177 supernovae (SNe) that have been discovered since 1997 during the course of the Lick Observatory Supernova Search with the...
Possible Recovery of SN 1961V In Hubble Space Telescope Archival Images (2002)
Van Dyk, Schuyler D., Filippenko, Alexei V., Li, Weidong
SN 1961V in NGC 1058 was originally classified by Fritz Zwicky as a ``Type V'' supernova. However, it has been argued that SN 1961V was not a genuine supernova, but instead the superoutburst of an...
The slope of the black-hole mass versus velocity dispersion correlation (2002)
Tremaine, Scott, Gebhardt, Karl, Bender, Ralf, Bower, Gary, Dressler, Alan, Faber, S. M., ...
Observations of nearby galaxies reveal a strong correlation between the mass of the central dark object M and the velocity dispersion sigma of the host galaxy, of the form log(M/M_sun) = a +...
Four New Delta Scuti Pulsators from a Variability Survey of 131 Stars (2002)
Sokoloski, J. L., Bildsten, Lars, Chornock, R., Filippenko, Alexei V.
In a photometric variability survey of 131 stars with B < 14 mag, we have found four new Delta Scuti stars. We were sensitive to oscillation amplitudes as low as a few mmag. The detection rate of...
Pun, Chun S. J., Michael, Eli, Zhekov, Svetozar A., McCray, Richard, Garnavich, Peter M., Challis, Peter M., ...
We report and interpret HST/STIS long-slit observations of the optical and ultraviolet (1150 - 10270 Angstrom) emission-line spectra of the rapidly brightening Spot 1 on the equatorial ring of SN...
Brotherton, Michael S., Grabelsky, Matthew, Canalizo, Gabriela, Van Breugel, Wil, Filippenko, Alexei V., Croom, Scott, ...
We present new Hubble Space Telescope (HST) WFPC2 images of the post-starburst quasar UN J1025-0040, which contains both an active galactic nucleus (AGN) and a 400-Myr-old nuclear starburst of...
SDSS J124602.54+011318.8: A Highly Variable AGN, Not an Orphan GRB Afterglow (2002)
Gal-Yam, Avishay, Ofek, Eran O., Filippenko, Alexei V., Chornock, Ryan, Li, Weidong
The optically variable source SDSS J124602.54+011318.8 first appears in Sloan Digital Sky Survey (SDSS) data as a bright point source with nonstellar colors. Subsequent SDSS imaging and spectroscopy...
Not Color Blind: Using Multiband Photometry to Classify Supernovae (2002)
Poznanski, Dovi, Gal-Yam, Avishay, Maoz, Dan, Filippenko, Alexei V., Leonard, Douglas C., Matheson, Thomas
Large numbers of supernovae (SNe) have been discovered in recent years, and many more will be found in the near future. Once discovered, further study of a SN and its possible use as an astronomical...
A Hubble Space Telescope Snapshot Survey of Nearby Supernovae (2002)
Li, Weidong, Filippenko, Alexei V., Van Dyk, Schuyler D., Hu, Jingyao, Qiu, Yulei, Modjaz, Maryam, ...
We present photometry of 12 recent supernovae (SNe) recovered in a {\it Hubble Space Telescope} Snapshot program, and tie the measurements to earlier ground-based observations, in order to study the...
Limits on the Mass of the Central Black Hole in 16 Nearby Bulges (2002)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., McIntosh, Daniel H., Ho, Luis C., Rudnick, Gregory, ...
Ho, Luis C., Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Rudnick, Greg, Filippenko, Alexei V., ...
The Slope of the Black-Hole Mass versus Velocity Dispersion Correlation (2002)
Scott Tremaine, Karl Gebhardt, Ralf Bender, Gary Bower, Alan Dressler, S. M. Faber, ...
Observations of nearby galaxies reveal a strong correlation between the mass of the central dark object M . and the velocity dispersion # of the host galaxy, of the form log(M . /M# ) = # + # log(#/#...
Ho, Luis C., Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Rudnick, Greg, Filippenko, Alexei V., ...
Gas-dynamical studies using the Hubble Space Telescope are an integral component for future progress in the search for massive black holes in galactic nuclei. Here we present an extensive set of gas...
Measuring Black Hole Masses Using Ionized Gas Kinematics (2001)
Barth, Aaron J., Sarzi, Marc, Ho, Luis C., Rix, Hans-Walter, Shields, Joseph C., Filippenko, Alexei V., ...
We describe techniques for measuring the central masses of galaxies using emission-line kinematics observed with the Hubble Space Telescope. For accurate results, it is necessary to model various...
Limits on the Mass of the Central Black Hole in 16 Nearby Bulges (2001)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., McIntosh, Daniel H., Ho, Luis C., Rudnick, Greg, ...
We report upper limits on the masses of black holes that can be present in the centers of 16 nearby galaxy bulges. These limits for our statistically complete sample were derived from the modeling of...
Nuclear Cusps and Cores in Early-type Galaxies As Relics of Binary Black Hole Mergers (2001)
Ravindranath, Swara, Ho, Luis C., Filippenko, Alexei V.
We present an analysis of the central cusp slopes and core parameters of early-type galaxies using a large database of surface brightness profiles obtained from Hubble Space Telescope observations....
The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method (2001)
Leonard, Douglas C., Filippenko, Alexei V., Gates, Elinor L., Li, Weidong, Eastman, Ronald G., Barth, Aaron J., ...
We present 30 optical spectra and 49 photometric epochs sampling the first 517 days after discovery of supernova (SN) 1999em, and derive its distance through the expanding photosphere method (EPM)....
Einstein's Biggest Blunder? High-Redshift Supernovae and the Accelerating Universe (2001)
Nearly 4 years ago, two teams of observational astronomers reported that high-redshift Type Ia supernovae are fainter than expected in a decelerating or freely coasting universe. The radical...
BVRI Photometry of Supernovae (2001)
Ho, Wynn C. G., Van Dyk, Schuyler D., Peng, Chien Y., Filippenko, Alexei V., Leonard, Douglas C., Matheson, Thomas, ...
We present optical photometry of one Type IIn supernova (1994Y) and nine Type Ia supernovae (1993Y, 1993Z, 1993ae, 1994B, 1994C, 1994M, 1994Q, 1994ae, and 1995D). SN 1993Y and SN 1993Z appear to be...
Fransson, Claes, Chevalier, Roger A., Filippenko, Alexei V., Leibundgut, Bruno, Barth, Aaron J., Fesen, Robert A., ...
Optical and ultraviolet observations of the Type IIn supernova 1995N at epochs between 321 and 1799 days after the explosion show three distinct velocity components. The narrow lines come from...
The Unique Type Ia Supernova 2000cx in NGC 524 (2001)
Li, Weidong, Filippenko, Alexei V., Gates, Elinor, Chornock, Ryan, Gal-Yam, Avishay, Ofek, Eran O., ...
We present extensive photometric and spectroscopic observations of the Type Ia supernova (SN Ia) 2000cx in the S0 galaxy NGC 524, which reveal it to be peculiar. Photometrically, SN 2000cx is...
Moran, Edward C., Kay, Laura E., Davis, Marc, Filippenko, Alexei V., Barth, Aaron J.
We present a composite 1-10 keV Seyfert 2 X-ray spectrum, derived from ASCA observations of a distance-limited sample of nearby galaxies. All 29 observed objects were detected. Above ~3 keV, the...
Central Structural Parameters of Early-Type Galaxies as Viewed with HST/NICMOS (2001)
Ravindranath, Swara, Ho, Luis C., Peng, Chien Y., Filippenko, Alexei V., Sargent, Wallace L. W.
We present surface photometry for the central regions of a sample of 33 early-type (E, S0, and S0/a) galaxies observed at 1.6 microns (H band) using the Hubble Space Telescope (HST). We employ a new...
Spectropolarimetry of the Type II Supernovae 1997ds, 1998A, and 1999gi (2001)
Leonard, Douglas C., Filippenko, Alexei V.
We present single-epoch spectropolarimetry of the Type II supernovae (SNe II) 1997ds, 1998A, and 1999gi. SN 1997ds and SN 1998A were both observed during the early photospheric phase, while...
Halderson, Eve L., Moran, Edward C., Filippenko, Alexei V., Ho, Luis C.
We have examined ROSAT soft X-ray observations of a complete, distance-limited sample of Seyfert and LINER galaxies. X-ray data are available for 46 out of 60 such objects which lie within a...
Riess, Adam G., Nugent, Peter E., Schmidt, Brian P., Tonry, John, Dickinson, Mark, Gilliland, Ronald L., ...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. SN 1997ff, was discovered in a repeat observation by the HST of...
Riess, Adam G., Nugent, Peter E., Schmidt, Brian P., Tonry, John, Dickinson, Mark, Gilliland, Ronald L., ...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of approximately 1.7, the farthest SN observed to date. The supernova, SN 1997, was discovered in a repeat...
Maoz, Dan, Barth, Aaron J., Ho, Luis C., Sternberg, Amiel, Filippenko, Alexei V.
We present broad-band (U, V, I,and H) and narrow-band(H-alpha+[N II] and Paschen-alpha) images of the circumnuclear starburst rings in two nearby spiral galaxies, NGC 1512 and NGC 5248, obtained with...
Optical Observations of Core-Collapse Supernovae (2001)
I present an overview of optical observations (mostly spectra) of Type II, Ib, and Ic supernovae (SNe). SNe II are defined by the presence of hydrogen, and exhibit a very wide variety of properties....
Detection of Nuclear X-ray Sources in Nearby Galaxies with Chandra (2001)
Ho, Luis C., Feigelson, Eric D., Townsley, Leisa K., Sambruna, Rita M., Garmire, Gordon P., Brandt, W. N., ...
We report preliminary results from an arcsecond-resolution X-ray survey of nearby galaxies using ACIS on board Chandra. The total sample consists of 41 low-luminosity AGNs, including Seyferts,...
Ravindranath, Swara, Ho, Luis C., Peng, Chien Y., Filippenko, Alexei V., Sargent, Wallace L. W.
We present preliminary results from surface photometry of a sample of early-type galaxies observed with NICMOS on board HST in the F160W (H-band) filter. Dust is found to occur mostly in galaxies...
Optical Spectroscopy of Type Ib/c Supernovae (2001)
Matheson, Thomas, Filippenko, Alexei V., Li, Weidong, Leonard, Douglas C., Shields, Joseph C.
We present 84 spectra of Type Ib/c and Type IIb supernovae (SNe), describing the individual SNe in detail. The relative depths of the helium absorption lines in the spectra of the SNe Ib appear to...
Adam G. Riess, Peter E. Nugent, Ronald L. Gilliland, Brian P. Schmidt, John Tonry, Mark Dickinson, ...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of D1.7, the farthest SN observed to date. The supernova, SN 1997+, was discovered in a repeat observation...
Supermassive Black Holes from the SUNNS survey (2000)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Rudnick, Greg, Ho, Luis C., McIntosh, Daniel H., ...
We report three new accurate mass measurements for the supermassive black holes hosted by the early-type disk galaxies NGC2787, NGC4459 and NGC4596. The targets were selected from a larger set of...
Preliminary Spectral Analysis of the Type II Supernova 1999em (2000)
Baron, E., Branch, David, Hauschildt, Peter H., Filippenko, Alexei V., Kirshner, R. P., Challis, P. M., ...
We have calculated fast direct spectral model fits to two early-time spectra of the Type-II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely early blue optical...
Lentz, Eric J., Baron, E., Lundqvist, Peter, Branch, David, Hauschildt, Peter H., Fransson, Claes, ...
We present spectral analysis of early observations of the Type IIn supernova 1998S using the general non-local thermodynamic equilibrium atmosphere code \tt PHOENIX}. We model both the underlying...
SuperMassive Black Holes in Bulges (2000)
Sarzi, Marc, Rix, Hans-Walter, Shields, Joseph C., Rudnick, Greg, Ho, Luis C., McIntosh, Daniel H., ...
We present spatially extended gas kinematics at parsec-scale resolution for the nuclear regions of four nearby disk galaxies, and model them as rotation of a gas disk in the joint potential of the...
Is it Round? Spectropolarimetry of the Type II-P Supernova 1999em (2000)
Leonard, Douglas C., Filippenko, Alexei V., Ardila, David R., Brotherton, Michael S.
We present the first multi-epoch spectropolarimetry of a type II plateau supernova (SN II-P), with optical observations of SN 1999em on days 7, 40, 49, 159, and 163 after discovery. These data are...
On the Spectroscopic Diversity of Type Ia Supernovae (2000)
Hatano, Kazuhito, Branch, David, Lentz, Eric J., Baron, E., Filippenko, Alexei V., Garnavich, Peter M.
A comparison of the ratio of the depths of two absorption features in the spectra of TypeIa supernovae (SNe Ia) near the time of maximum brightness with the blueshift of the deep red Si II absorption...
Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2 (2000)
Coil, Alison L., Matheson, Thomas, Filippenko, Alexei V., Leonard, Douglas C., Tonry, John, Riess, Adam G., ...
We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0.455 and SN 1999fv...
HST Spectroscopy of Spot 1 on the Circumstellar Ring of SN 1987A (2000)
Michael, Eli, McCray, Richard, Pun, C. S. J., Garnavich, Peter, Challis, Peter, Kirshner, Robert P., ...
We present ultraviolet and optical spectra of the first bright spot (PA = 29 degrees) on Supernova 1987A's equatorial circumstellar ring taken with the Space Telescope Imaging Spectrograph. We...
The Subluminous Type Ia Supernova 1998de in NGC 252 (2000)
Modjaz, Maryam, Li, Weidong, Filippenko, Alexei V., King, Jennifer Y., Leonard, Douglas C., Matheson, Thomas, ...
We present spectroscopic and extensive photometric observations of supernova (SN) 1998de in the S0 galaxy NGC 252, discovered during the course of the Lick Observatory Supernova Search. These data,...
Monte Carlo Simulations of Type Ia Supernova Observations in Supernova Surveys (2000)
Li, Weidong, Filippenko, Alexei V., Riess, Adam G.
We have performed Monte Carlo simulations of type Ia supernova (SN Ia) surveys to quantify their efficiency in discovering peculiar overluminous and underluminous SNe Ia. We determined how the type...
A High Intrinsic Peculiarity Rate Among Type Ia Supernovae (2000)
Li, Weidong, Filippenko, Alexei V., Treffers, R. R., Riess, A. G., Hu, Jingyao, Qiu, Y. L.
We have compiled a sample of 45 Type Ia supernovae (SNe Ia) discovered by the Lick Observatory Supernova Search (LOSS) and the Beijing Astronomical Observatory Supernova Survey (BAOSS), and...
A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion (2000)
Gebhardt, Karl, Bender, Ralf, Bower, Gary, Dressler, Alan, Faber, S. M., Filippenko, Alexei V., ...
We describe a correlation between the mass M_BH of a galaxy's central black hole and the luminosity-weighted line-of-sight velocity dispersion sigma_e within the half-light radius. The result is...
Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J (2000)
Matheson, Thomas, Filippenko, Alexei V., Ho, Luis C., Barth, Aaron J., Leonard, Douglas C.
We present a detailed study of line structure in early to late-time spectra of Supernova (SN) 1993J. Spectra during the nebular phase, but within the first two years after explosion, exhibit...
Double-Peaked Broad Emission Lines in NGC 4450 and Other LINERs (2000)
Ho, Luis C., Rudnick, Greg, Rix, Hans-Walter, Shields, Joseph C., McIntosh, Daniel H., Filippenko, Alexei V., ...
Spectra taken with HST reveal that NGC 4450 emits Balmer emission lines with displaced double peaks and extremely high-velocity wings. This characteristic line profile, previously seen in a few...
Evidence for a Black Hole and Accretion Disk in the LINER NGC 4203 (2000)
Shields, Joseph C., Rix, Hans-Walter, McIntosh, Daniel H., Ho, Luis C., Rudnick, Greg, Filippenko, Alexei V., ...
We present spectroscopic observations from the Hubble Space Telescope that reveal for the first time the presence of a broad pedestal of Balmer-line emission in the LINER galaxy NGC 4203. The...
Probing black hole X-ray binaries with the Keck telescopes (2000)
Harlaftis, Emilios T., Filippenko, Alexei V.
The advent of the large effective apertures of the Keck telescopes has resulted in the determination with unprecedented accuracy of the mass functions and mass ratios of faint (R ~ 21 mag) X-ray...
Riess, Adam G., Filippenko, Alexei V., Liu, Michael C., Challis, Peter, Clocchiatti, Alejandro, Diercks, Alan, ...
We have measured the rest-frame B,V, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z=0.46), using HST and ground-based near-infrared detectors. A goal of this study...
Helium Emission in the Type Ic SN 1999cq (2000)
Matheson, Thomas, Filippenko, Alexei V., Chornock, Ryan, Leonard, Douglas C., Li, Weidong
We present the first unambiguous detection of helium emission lines in spectra of Type Ic supernovae (SNe Ic). The presence of He I lines, with full width at half maximum ~ 2000 km/s, and the...
Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics (2000)
Karl Gebhardt, John Kormendy, Luis C. Ho, Ralf Bender, Gary Bower, Alan Dressler, ...
Black hole (BH) masses that have been measured by reverberation mapping in active galaxies fall significantly below the correlation between bulge luminosity and BH mass determined from spatially...
Probing the Geometry of Supernovae with Spectropolarimetry (1999)
Leonard, Douglas C., Filippenko, Alexei V., Matheson, Thomas
We present results from a spectropolarimetric survey of young supernovae completed at the Keck Observatory, including at least one example from each of the major supernova types: Ia (1997dt), Ib...
Evidence for Asphericity in the Type IIn Supernova 1998S (1999)
Leonard, Douglas C., Filippenko, Alexei V., Barth, Aaron J., Matheson, Thomas
We present optical spectropolarimetry obtained at the Keck-II 10-m telescope on 1998 March 7 UT along with total flux spectra spanning the first 494 days after discovery (1998 March 2 UT) of the...
Spectral Models of the Type Ic SN 1994I in M51 (1999)
Baron, E., Branch, David, Hauschildt, Peter H., Filippenko, Alexei V., Kirshner, R. P.
We present detailed non-local thermodynamic equilibrium (NLTE) synthetic spectra for comparison with a time series of observed optical spectra of the Type Ic supernova 1994I which occurred in M51....
The Risetime of Nearby Type Ia Supernovae (1999)
Riess, Adam G., Filippenko, Alexei V., Li, Weidong, Treffers, Richard R., Schmidt, Brian P., Qiu, Yulei, ...
We present calibrated photometric measurements of the earliest detections of nearby type Ia supernovae (SNe Ia). The set of ~30 new, unfiltered CCD observations delineate the early rise behavior of...
A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes (1999)
Riess, Adam G., Filippenko, Alexei V., Li, Weidong, Schmidt, Brian P.
We have compared the risetime for samples of nearby and high-redshift type Ia supernovae (SNe Ia). The fiducial risetime of the nearby SNe Ia is 2.5+/-0.4 days longer than the proemial risetime...
A Spectacular Post-Starburst Quasar (1999)
Brotherton, M. S., Van Breugel, Wil, Stanford, S. A., Smith, R. J., Boyle, B. J., Miller, Lance, ...
We report the discovery of a spectacular ``post-starburst quasar'' UN J1025-0040 (B=19; z=0.634). The optical spectrum is a chimera, displaying the broad Mg II emission line and strong blue continuum...
Kraemer, Steven B., Ho, Luis C., Crenshaw, D. Michael, Shields, Joseph C., Filippenko, Alexei V.
We have combined Hubble Space Telescope/Faint Object Spectrograph, ground-based, and Infrared Space Observatory spectra of the nucleus of NGC 4395, the least luminous and nearest known type 1 Seyfert...
Late-Time Optical and UV Spectra of SN 1979C and SN 1980K (1998)
Fesen, Robert A., Gerardy, Christopher L., Filippenko, Alexei V., Matheson, Thomas, Chevalier, Roger A., Kirshner, Robert P., ...
A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8 yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad 5500 km s^{-1} emission lines of H\alpha, [O...
Hubble Space Telescope WFPC2 Imaging of SN 1979C and Its Environment (1998)
Van Dyk, Schuyler D., Peng, Chien Y., Barth, Aaron J., Filippenko, Alexei V., Chevalier, Roger A., Fesen, Robert A., ...
The locations of supernovae in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. As part of a program to study the environments of supernovae...
Results from the High-Z Supernova Search Team (1998)
Filippenko, Alexei V., Riess, Adam G.
We review the use of Type Ia supernovae for cosmological distance determinations. Low-redshift SNe Ia ($z \lesssim 0.1$) demonstrate that (a) the Hubble expansion is linear, (b) $H_0 = 65 \pm 2$...
Schmidt, Brian P., Suntzeff, Nicholas B., Phillips, M. M., Schommer, Robert A., Clocchiatti, Alejandro, Kirshner, Robert P., ...
The High-Z Supernova Search is an international collaboration to discover and monitor type Ia supernovae (SN Ia) at $z > 0.2$ with the aim of measuring cosmic deceleration and global curvature. Our...
Riess, Adam G., Filippenko, Alexei V., Challis, Peter, Clocchiattia, Alejandro, Diercks, Alan, Garnavich, Peter M., ...
We present observations of 10 type Ia supernovae (SNe Ia) between 0.16 < z < 0.62. With previous data from our High-Z Supernova Search Team, this expanded set of 16 high-redshift supernovae and 34...
Snapshot Distances to Type Ia Supernovae -- All in ``One'' Night's Work (1998)
Riess, Adam G., Nugent, Peter, Filippenko, Alexei V., Kirshner, Robert P., Perlmutter, Saul
We present an empirical method which measures the distance to a Type Ia supernova (SN Ia) with a precision of ~ 10% from a single night's data. This method measures the supernova's age and...
Evidence for a Physically Compact Narrow-Line Region in the Seyfert 1 Galaxy NGC 5548 (1997)
Kraemer, Steven B., Crenshaw, D. Michael, Filippenko, Alexei V., Peterson, Bradley M.
We have combined HST/FOS and ground-based spectra of the Seyfert 1 galaxy NGC 5548 to study the narrow emission lines over the 1200 -- 10,000 angstrom region. All of the spectra were obtained when...
The Ultraviolet Spectra of LINERs: A Comparative Study (1997)
Maoz, Dan, Koratkar, Anuradha, Shields, Joseph C., Ho, Luis C., Filippenko, Alexei V., Sternberg, Amiel
Imaging studies have shown that about 25% of LINER galaxies display a compact nuclear UV source. As part of a program to study the nature of LINERs and their connection to the active galaxy...
A Doppler Map and Mass-ratio Constraint for the Black-Hole X-ray Nova Ophiuchi 1977 (1997)
Harlaftis, Emilios T., Steeghs, Danny, Horne, Keith, Filippenko, Alexei V.
We have reanalyzed Keck observations of Nova Oph 1977 to extend the work done by Filippenko et al. (1997), who recently determined a mass function f(M_x) = 4.86 +/- 0.13 M_o for the compact object....
A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission (1997)
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W., Peng, Chien Y.
We present the results of an optical spectroscopic survey designed to search for low-luminosity, "dwarf" Seyfert nuclei in a magnitude-limited sample of 486 bright, northern galaxies....
The Influence of Bars on Nuclear Activity (1997)
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
We test ideas on fueling of galactic nuclei by bar-driven inflow by comparing the detection rate and intensity of nuclear H II regions and AGNs among barred and unbarred galaxies in a sample of over...
Properties of H II Regions in the Centers of Nearby Galaxies (1997)
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
As part of an optical spectroscopic survey of nearby, bright galaxies, we have identified a sample of over 200 emission-line nuclei having optical spectra resembling those of giant extragalactic H II...
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
We have completed an optical spectroscopic survey of the nuclear regions (r < 200 pc) of a large sample of nearby galaxies. Although the main objectives of the survey are to search for low-luminosity...
A Search for "Dwarf" Seyfert Nuclei. V. Demographics of Nuclear Activity in Nearby Galaxies (1997)
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
We use the sample of emission-line nuclei derived from a recently completed optical spectroscopic survey of nearby galaxies to quantify the incidence of local (z = 0) nuclear activity. Consistent...
Probing the Geometry and Circumstellar Environment of SN 1993J in M81 (1997)
Tran, Hien D., Filippenko, Alexei V., Schmidt, Gary D., Bjorkman, Karen S., Jannuzi, Buell T., Smith, Paul S.
We have monitored the polarized radiation of the Type IIb SN 1993J in M81 over a period of 41 days, starting from 7 days after the explosion on 1993 March 27.5 (UT). Our data show clear evidence that...
Newman, Jeffrey A., Eracleous, Michael, Filippenko, Alexei V., Halpern, Jules P.
The optical spectrum of the broad-line radio galaxy Arp 102B has been monitored for more than thirteen years to investigate the nature of the source of its broad, double-peaked hydrogen Balmer...
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Low-Luminosity Seyfert Nuclei (1996)
Ho, Luis C., Filippenko, Alexei V., Sargent, Wallace L. W.
We describe a new sample of Seyfert nuclei discovered during the course of an optical spectroscopic survey of nearby galaxies. The majority of the objects, many recognized for the first time, have...
Ho, Luis C., Filippenko, Alexei V.
We present evidence that some of the compact, luminous, young star clusters recently discovered through images taken with the Hubble Space Telescope (HST) have masses comparable to those of old...
Dynamical Evidence for a Luminous, Young Globular Cluster in NGC 1569 (1996)
Ho, Luis C., Filippenko, Alexei V.
Recent high-resolution observations with the Hubble Space Telescope (HST) reveal that star clusters of extraordinary luminosity and compactness are commonly found in a variety of starburst systems....
An Atlas of Hubble Space Telescope Ultraviolet Images of Nearby Galaxies (1996)
Maoz, Dan, Filippenko, Alexei V., Ho, Luis C., Macchetto, F. Duccio, Rix, Hans-Walter, Schneider, Donald P.
We present an atlas of UV ($\sim 2300$ \AA) images, obtained with the Hubble Space Telescope (HST) Faint Object Camera, of the central $22''\times 22''$ of 110 galaxies. The observed galaxies are an...
Hubble Space Telescope Ultraviolet Images of Five Circumnuclear Star-Forming Rings (1996)
Maoz, Dan, Barth, Aaron J., Sternberg, Amiel, Filippenko, Alexei V., Ho, Luis C., Macchetto, F. Duccio, ...
We present UV (2300 Ang) images, obtained with the HST Faint Object Camera, of the central 20'' of five galaxies containing circumnuclear star-forming rings. The five galaxies are from a well-defined...
Hubble Space Telescope Spectroscopic Observations of the Ejecta of SN 1987A at 2000 Days (1996)
Wang, Lifan, Wheeler, J. Craig, Kirshner, Robert P., Challis, Peter M., Filippenko, Alexei V., Fransson, Claes, ...
We have used the Faint Object Spectrograph on the Hubble Space Telescope to observe the spectra of SN 1987A over the wavelength range 2000 -- 8000\ \AA\ on dates 1862 and 2210 days after the...
Detection of Compact Ultraviolet Nuclear Emission in LINER Galaxies (1994)
Maoz, Dan, Filippenko, Alexei V., Ho, Luis C., Rix, Hans-Walter, Bahcall, John N., Schneider, Donald P., ...
Low-ionization nuclear emission-line regions (LINERs), which exist in a large fraction of galaxies, may be the least luminous manifestation of quasar activity. The nature of LINERs has, however,...
SN~1991T: Reflections of Past Glory (1994)
Schmidt, Brian P., Kirshner, Robert P., Leibundgut, Bruno, Wells, Lisa A., Porter, Alain C., Ruiz-Lapuente, Pilar, ...
We have obtained photometry and spectra of SN~1991T which extend more than 1000 days past maximum light, by far the longest a SN~Ia has been followed. Although SN~1991T exhibited nearly normal...
The Berkeley Automatic Imaging Telescope (1993)
Michael W. Richmond, Richard R. Treffers, Alexei V. Filippenko
We describe the design and control system of the Berkeley Automatic Imaging Telescope (BAIT), an observatory that performs all its tasks with minimal human intervention. We concentrate on the...
Physical conditions in low-luminosity active galactic nuclei (1984)
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Physical conditions in the nuclei of emission-line galaxies are investigated by...
Thesis (Ph. D.)--California Institute of Technology, 1984.
Black holes in the Milky Way Galaxy
Extremely strong observational evidence has recently been found for the presence of black holes orbiting a few relatively normal stars in our Milky Way Galaxy and also at the centers of some...
Black holes in the Milky Way Galaxy
Extremely strong observational evidence has recently been found for the presence of black holes orbiting a few relatively normal stars in our Milky Way Galaxy and also at the centers of some...