Early-type galaxies in the PEARS survey: Probing the stellar populations at moderate redshift (2009)
Ferreras, Ignacio, Pasquali, Anna, Malhotra, Sangeeta, Rhoads, James, Cohen, Seth, Windhorst, Rogier, ...
Using HST/ACS slitless grism spectra from the PEARS program, we study the stellar populations of morphologically selected early-type galaxies in the GOODS North and South fields. The sample -...
A Multi-Color Optical Survey of the Orion Nebula Cluster. Part I: the Catalog (2009)
Da Rio, Nicola, Robberto, Massimo, Soderblom, David R., Panagia, Nino, Hillenbrand, Lynne A., Palla, Francesco, ...
We present U, B, V, I broad-band, 6200A TiO medium-band and Halpha photometry of the Orion Nebula Cluster obtained with the WFI imager at the ESO/MPI 2.2 telescope. The nearly-simultaneous...
Radio Emission from Supernovae (2009)
Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., Williams, Christopher L., Stockdale, Christopher J., ...
Study of radio supernovae over the past 27 years includes more than three dozen detected objects and more than 150 upper limits. From this work it is possible to identify classes of radio properties,...
Unsolved Problems about Supernovae (2009)
A number of unsolved problems and open questions about the nature and the properties of supernovae are identified and briefly discussed. Some suggestions and directions toward possible solutions are...
Radio Supernovae: Circum-Stellar Investigation (C.S.I.) of Supernova Progenitor Stars (2009)
Stockdale, Christopher J., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., Immler, Stefan, ...
Prior to explosion, a supernova progenitor slowly loses significant amounts of its hydrogen envelope in a stellar wind. After the explosion, the blastwave interacts with this wind producing...
Eleven Years of Radio Monitoring of the type IIn Supernova SN 1995N (2009)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array for 11 years. We also observed it at low radio...
The WFC3 Galactic Bulge Treasury Program: A First Look at Resolved Stellar Population Tools (2008)
Brown, Thomas M., Sahu, Kailash, Zoccali, Manuela, Renzini, Alvio, Ferguson, Henry C., Anderson, Jay, ...
[Abridged] When WFC3 is installed on HST, the community will have powerful new tools for investigating resolved stellar populations. The WFC3 Galactic Bulge Treasury program will obtain deep imaging...
Eleven years of radio monitoring of the Type IIn supernova SN 1995N (2008)
Chandra, Poonam, Stockdale, Christopher J., Chevalier, Roger A., Van Dyk, Schuyler D., Ray, Alak, Kelley, Matthew T., ...
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array (VLA) for 11 years. We also observed it at low...
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry (2008)
Clarkson, Will, Sahu, Kailash, Anderson, Jay, Smith, T. Ed., Brown, Thomas M., Rich, R. Michael, ...
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than...
Bernard, Jean-Philippe, Reach, William T., Paradis, Deborah, Meixner, Margaret, Paladini, Roberta, Kawamura, Akiko, ...
The goal of this paper is to present the results of a preliminary analysis of the extended infrared (IR) emission by dust in the interstellar medium (ISM) of the Large Magellanic Cloud (LMC). We...
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several novel features: (i)...
Ultraviolet Light Curves of Supernovae with Swift Uvot (2008)
Brown, Peter J., Holland, Stephen T., Immler, Stefan, Milne, Peter, Roming, Peter W. A., Gehrels, Neil, ...
We present ultravioliet (UV) observations of supernovae (SNe) obtained with the UltraViolet/Optical Telescope (UVOT) on board the Swift spacecraft. This is the largest sample of UV light curves from...
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,...
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
Long-Term Radio Monitoring of SN 1993J (2007)
Weiler, Kurt W., Williams, Christopher L., Panagia, Nino, Stockdale, Christopher J., Kelley, Matthew T., Sramek, Richard A., ...
We present our extensive observations of the radio emission from supernova (SN) 1993J, in M81 (NGC 3031), made with the Very Large Array, at 90, 20, 6, 3.6, 2, 1.2, and 0.7 cm, as well as numerous...
Planets in the Galactic Bulge: Results from the SWEEPS Project (2007)
Sahu, Kailash C., Casertano, Stefano, Valenti, Jeff, Bond, Howard E., Brown, Thomas M., Smith, T. Ed, ...
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massive, and (iii)...
Type II Radio Supernovae and SN 1987A (2007)
Kurt W. Weiler, Marcos J. Montes, Richard A. Sramek, Nino Panagia
. Study of radio supernovae over the past 17 years includes two dozen detected objects and almost 80 upper limits. From this work we are able to identify classes of radio properties, demonstrate...
Sparks, William B., Bond, Howard E., Cracraft, Misty, Levay, Zolt, Crause, Lisa A., Dopita, Michael A., ...
Following the outburst of the unusual variable star V838 Monocerotis in 2002, a spectacular light echo appeared. A light echo provides the possibility of direct geometric distance determination,...
Long Term Radio Monitoring of SN 1993J (2007)
Weiler, Kurt W., Williams, Christopher L., Panagia, Nino, Stockdale, Christopher J., Kelley, Matthew T., Sramek, Richard A., ...
We present our observations of the radio emission from supernova (SN) 1993J, in M 81 (NGC 3031), made with the VLA, from 90 to 0.7 cm, as well as numerous measurements from other telescopes. The...
Radio Observations of Supernovae (2007)
Panagia, Nino, Weiler, Kurt W., Van Dyk, Schuyler D., Sramek, Richard A., Stockdale, Christopher J.
Study of radio supernovae over the past 25 years includes two dozen detected objects and more than 100 upper limits. From this work it is possible to identify classes of radio properties, demonstrate...
Light Curves of Radio Supernovae (2007)
Kelley, Matthew T., Stockdale, Christopher J., Weiler, Kurt W., Williams, Christopher L. M., Panagia, Nino, Sramek, Richard A., ...
We present the results from the on-going radio monitoring of recent type II supernovae (SNe), including SNe 2004et, 2004dj, 2002hh, 2001em, and 2001gd. Using the Very Large Array to monitor these...
Recent Type II Radio Supernovae (2007)
Stockdale, Christopher J., Kelley, Matthew T., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Marcaide, J. M., ...
We present the results of radio observations, taken primarily with the Very Large Array, of Supernovae 1993J, 2001gd, 2001em, 2002hh, 2004dj, and 2004et. We have fit a parameterized model to the...
The Radio Evolution of SN 2001gd (2007)
Stockdale, Christopher J., Williams, Christopher L., Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., ...
We present the results of observations of the radio emission from Supernova 2001gd in NGC 5033 from 2002 February 8 through 2006 September 25. The data were obtained using the Very Large Array at...
Redshifts of Emission-Line Objects in the Hubble Ultra Deep Field (2007)
Xu, Chun, Pirzkal, Norbert, Malhotra, Sangeeta, Rhoads, James E., Mobasher, Bahram, Daddi, Emanuele, ...
We present redshifts for 115 emission-line objects in the Hubble Ultra Deep Field identified through the Grism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism...
Ultraviolet Observations of Supernovae (2007)
The motivations to make ultraviolet (UV) studies of supernovae (SNe) are reviewed and discussed in the light of the results obtained so far by means of IUE and HST observations. It appears that UV...
Type Ia Supernova Rates Near and Far (2007)
Panagia, Nino, Della Valle, Massimo, Mannucci, Filippo
(ABRIDGED) Recently, three important observational results were established: (a) The evolution of the SNIa rate with redshift show that the rate rises up to z~0.8, when the Universe was 6.5 Gyr old,...
Radio Observations of Supernovae (2007)
Panagia, Nino, Weiler, Kurt W., Van Dyk, Schuyler D., Sramek, Richard A., Stockdale, Christopher J.
Study of radio supernovae over the past 25 years includes two dozen detected objects and more than 100 upper limits. From this work it is possible to identify classes of radio properties, demonstrate...
Stellar populations in the Magellanic Clouds: looking through the dust (2007)
De Marchi, Guido, Panagia, Nino, Romaniello, Martino
We present the first results of our study of stellar populations in the Large and Small Magellanic Clouds based on multi-band WFPC2 observations of "random" fields taken as part of the "pure...
Redshifts of Emission Line Objects in the Hubble Ultra Deep Field (2007)
Xu, Chun, Pirzkal, Norbert, Malhotra, Sangeeta, Rhoads, James E., Mobasher, Bahram, Daddi, Emanuele, ...
We present redshifts for 115 emission line objects in the Hubble Ultra Deep Field (HUDF) identified through the GRism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism...
Redshifts of emission-line objects in the Hubble Ultra Deep Field (2007)
Xu, Chun, Pirzkal, Norbert, Malhotra, Sangeeta, Rhoads, James E., Mobasher, Bahram, Daddi, Emanuele, ...
We present redshifts for 115 emission-line objects in the Hubble Ultra Deep Field identified through the Grism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism...
Transiting extrasolar planetary candidates in the Galactic bulge (2006)
Sahu, Kailash C., Casertano, Stefano, Bond, Howard E., Valenti, Jeff, Smith, T. Ed, Minniti, Dante, ...
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and more recently...
The Hubble Ultra Deep Field (2006)
Beckwith, Steven V. W., Stiavelli, Massimo, Koekemoer, Anton M., Caldwell, John A. R., Ferguson, Henry C., Hook, Richard, ...
This paper presents the Hubble Ultra Deep Field (HUDF), a one million second exposure of an 11 square minute-of-arc region in the southern sky with the Hubble Space Telescope. The exposure time was...
Meixner, Margaret, Gordon, Karl D., Indebetouw, Remy, Hora, Joseph L., Whitney, Barbara, Blum, Robert, ...
We are performing a uniform and unbiased, ~7x7 degrees imaging survey of the Large Magellanic Cloud (LMC), using the IRAC and MIPS instruments on board the Spitzer Space Telescope in order to survey...
Massive-Star Supernovae as Major Dust Factories (2006)
Sugerman, Ben E. K., Ercolano, Barbara, Barlow, M. J., Clayton, Geoffrey C., Zijlstra, Albert A., ...
We present late-time optical and mid-infrared observations of the Type-II supernova 2003gd in NGC 628. Mid-infrared excesses consistent with cooling dust in the ejecta are observed 499-678 days after...
A Search for Radio Emission from Type Ia Supernovae (2006)
Panagia, Nino, Van Dyk, Schuyler D., Weiler, Kurt W., Sramek, Richard A., Stockdale, Christopher J., Murata, Kimberly P.
We present and discuss the radio observations of 27 Type Ia supernovae (SNe Ia) observed over two decades with the Very Large Array. No SN Ia has been detected so far in the radio, implying a very...
Evolution of the Reverse Shock Emission from SNR 1987A (2006)
Heng, Kevin, McCray, Richard, Zhekov, Svetozar A., Challis, Peter M., Chevalier, Roger A., Crotts, Arlin P. S., ...
We present new (2004 July) G750L and G140L Space Telescope Imaging Spectrograph (STIS) data of the H-alpha and Ly-alpha emission from supernova remnant (SNR) 1987A. With the aid of earlier data, from...
The Hubble Ultra Deep Field (2006)
Beckwith, Steven V. W., Stiavelli, Massimo, Koekemoer, Anton M., Caldwell, John A. R., Ferguson, Henry C., Hook, Richard, ...
This paper presents the Hubble Ultra Deep Field (HUDF), a 1 million s exposure of an 11 arcmin2 region in the southern sky with the Advanced Camera for Surveys on the Hubble Space Telescope using...
On the Reionization of the Universe (2005)
I present first principle model calculations for the reionization of the Universe, which provide simple diagnostics to identify the reionization sources. Within this frame, I also discuss the results...
Romaniello, Martino, Scuderi, Salvatore, Panagia, Nino, Salerno, Rosa Maria, Blanco, Carlo
As a part of an ongoing effort to characterise the young stellar populations in the Large Magellanic Cloud, we present HST-WFPC2 broad and narrow band imaging of two fields with recent star formation...
Romaniello, Martino, Patat, Ferdinando, Panagia, Nino, Sparks, William B., Gilmozzi, Roberto, Spyromilio, Jason
We have used FORS1 at the ESO VLT to search for light echoes in imaging polarimetry from four historical supernovae in the face-on nearby spiral galaxy M83 (NGC 5236). No echoes were detected around...
High Redshift Supernovae: Cosmological Implications (2005)
We review the findings for the values of the cosmological parameters as derived from high-redshift SNIa measurements. The most recent results confirm the picture of a non-empty inflationary Universe...
SN 1987A: The Unusual Explosion of a Normal Type II Supernova (2004)
I review the unwrapping story the SN 1987A explosion event, and the main discoveries associated with it. I will show that, although this supernova is somewhat peculiar, the study of SN 1987A has...
Detecting Primordial Stars (2004)
We discuss the expected properties of the first stellar generations in the Universe. We find that it is possible to discern truly primordial populations from the next generation of stars by measuring...
The Initial Conditions to Star Formation: Low Mass Stars at Low Metallicity (2004)
Romaniello, Martino, Panagia, Nino, Robberto, Massimo
We have measured the present accretion rate of roughly 800 low-mass (~1-1.4 Mo) pre-Main Sequence stars in the field of SN 1987A in the Large Magellanic Cloud. The stars with statistically...
A Redshift z=5.4 Lyman alpha Emitting Galaxy with Linear Morphology in the GRAPES/UDF Field (2004)
Rhoads, James E., Panagia, Nino, Windhorst, Rogier A., Malhotra, Sangeeta, Pirzkal, Norbert, Xu, Chun, ...
We have discovered an extended Lyman alpha plume associated with a compact source at redshift 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project....
High Redshift Supernova Rates (2004)
Dahlen, Tomas, Strolger, Louis-Gregory, Riess, Adam G., Mobasher, Bahram, Chary, Ranga-Ram, Conselice, Christopher J., ...
We use a sample of 42 supernovae detected with the Advanced Camera for Surveys on-board the Hubble Space Telescope as part of the Great Observatories Origins Deep Survey to measure the rate of core...
Romaniello, Martino, Robberto, Massimo, Panagia, Nino
We have measured the present accretion rate of roughly 800 low-mass (~1-1.4 Mo) pre-Main Sequence stars in the field of Supernova 1987A in the Large Magellanic Cloud (LMC, Z~0.3 Zo). It is the first...
Ryder, Stuart D., Sadler, Elaine M., Subrahmanyan, Ravi, Weiler, Kurt W., Panagia, Nino, Stockdale, Christopher
We describe the radio evolution of SN 2001ig in NGC 7424, from 700 days of multi-frequency monitoring with the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA). We find that...
A Geometric Determination of the Distance to SN 1987A and the LMC (2003)
Using the definitive reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved our original analysis (Panagia et al....
The Quest for Primordial Stellar Populations and the James Webb Space Telescope (2003)
The NASA/ESA/CSA James Webb Space Telescope (JWST) will be the successor to the Hubble Space Telescope and may be launched as early as mid-2011. The key scientific goals for JWST are discovering and...
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...
Radio Emission from SN 2001gd in NGC 5033 (2003)
Stockdale, Christopher J., Weiler, Kurt W., Van Dyk, Schuyler D., Montes, Marcos J., Panagia, Nino, Sramek, Richard A., ...
We present the results of monitoring the radio emission from the Type IIb supernova SN 2001gd between 2002 February 8 and 2002 October 28. Most of the data were obtained using the Very Large Array at...
An energetic stellar outburst accompanied by circumstellar light echoes (2003)
Bond, Howard E., Henden, Arne, Levay, Zoltan G., Panagia, Nino, Sparks, William B., Starrfield, Sumner, ...
Some classes of stars, including supernovae and novae, undergo explosive outbursts that eject stellar material into space. In 2002, the previously unknown variable star V838 Monocerotis brightened...
The rate and the origin of type Ia supernovae in radiogalaxies (2003)
Della Valle, Massimo, Panagia, Nino
An analysis of type Ia supernova (SNIa) events in early type galaxies from Evans et al (1989) database provides strong evidence that the rate of type Ia supernovae (SNe) in radio-loud galaxies is...
Primordial Stellar Populations (2002)
We review the expected properties of the first stellar generations in the Universe. In particular, we consider and discuss the diagnostics, based on the emission from associated HII regions, that...
Radio Observations of GRB Afterglows (2002)
Weiler, Kurt W., Panagia, Nino, Montes, Marcos J.
Since 1997 the afterglow of gamma-ray bursting sources (GRBs) has occasionally been detected in the radio, as well in other wavelengths bands. In particular, the interesting and unusual gamma-ray...
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...
Palen, Stacy, Balick, Bruce, Hajian, Arsen R., Terzian, Yervant, Bond, Howard, Panagia, Nino
We have combined two epochs of Hubble Space Telescope WFPC2 imaging data with ground-based expansion velocities to determine distances to three planetary nebulae (NGC 6578, NGC 6884, and IC 2448). We...
Accurate Stellar Population Studies from Multiband Photometric Observations (2001)
Romaniello, Martino, Panagia, Nino, Scuderi, Salvatore, Kirshner, Robert P.
We present a new technique based on multi-band near ultraviolet and optical photometry to measure both the stellar intrinsic properties, ie luminosity and effective temperature, and the interstellar...
TTauri Stars in the Large Magellanic Cloud: a combined HST and VLT effort (2001)
Romaniello, Martino, Panagia, Nino, Scuderi, Salvatore, Gilmozzi, Roberto, Tolstoy, Eline, Favata, Fabio, ...
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low mass pre-Main...
SN1998bw/GRB980425 and Radio Supernovae (2001)
Weiler, Kurt W., Panagia, Nino, Montes, Marcos J.
The unusual supernova SN1998bw, which is thought to be related to the gamma-ray burster GRB980425, is a possible link between the two classes of objects. Analyzing the extensive radio emission data...
Chemical composition and origin of nebulae around Luminous Blue Variables (2001)
Nota, Antonella, Panagia, Nino, Smith, Linda J., Langer, Norbert
We use the analysis of the heavy element abundances (C, N, O, S) in circumstellar nebulae around Luminous Blue Variables to infer the evolutionary phase in which the material has been ejected. (1) We...
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...
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...
Pre-Supernova Evolution of Massive Stars (2000)
We present the preliminary results of a detailed theoretical investigation on the hydrodynamical properties of Red Supergiant (RSG) stars at solar chemical composition and for stellar masses ranging...
The properties of supernovae (SNe) are reviewed. It is shown that the observed characteristics of the morphological classes of SNe (types Ia, Ib/c, II) can be explained in terms of two basic...
Observational Constraints to the Evolution of Massive Stars (2000)
We consider some aspects of the evolution of massive stars which can only be elucidated by means of "indirect" observations, i.e. measurements of the effects of massive stars on their environments....
Radio Supernovae and GRB 980425 (2000)
Weiler, Kurt W., Panagia, Nino, Sramek, Richard A., Van Dyk, Schuyler D., Montes, Marcos J., Lacey, Christina K.
Study of radio supernovae (RSNe) over the past 20 years includes two dozen detected objects and more than 100 upper limits. From this work we are able to identify classes of radio properties,...
Young Stellar Populations Around SN1987A (2000)
Panagia, Nino, Romaniello, Martino, Scuderi, Salvatore, Kirshner, Robert P.
We present the results of a study of the stellar population in a region of 30 pc radius around SN1987A, based on an analysis of multi-band HST-WFPC2 images. The effective temperature, radius and,...
Romaniello, Martino, Salaris, Maurizio, Cassisi, Santi, Panagia, Nino
We have used HST-WFPC2 multiband observations of a field around SN 1987A in the Large Magellanic Cloud to measure its distance from the Sun. The observations allowed us to carefully determine the...
HST study of the Stellar Populations within 30 pc of SN 1987A (1999)
Romaniello, Martino, Panagia, Nino, Scuderi, Salvatore
We have studied the stellar populations in a region of 30 pc around SN 1987A in the Large Magellanic Cloud using multi-band HST-WFPC2 images. The effective temperature, luminosity and reddening of...
Detection of Pre-Shock Dense Circumstellar Material of SN 1978K (1998)
Chu, You-Hua, Caulet, Adeline, Montes, Marcos, Panagia, Nino, Van Dyk, Schuyler, Weiler, Kurt
The supernova SN 1978K has been noted for its lack of emission lines broader than a few thousand km/s since its discovery in 1990. Modeling of the radio spectrum of the peculiar SN 1978K indicates...
New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A (1998)
Michael, Eli, McCray, Richard, Pun, C. S. J., Borkowski, Kazimierz, Garnavich, Peter, Challis, Peter, ...
We describe and model high velocity (~15,000 km/s) Lyman alpha and Balmer alpha emission from supernova remnant 1987A seen in September and October 1997 with the Space Telescope Imaging Spectrograph....
Gonzalez, Rosa A., Allen, R. J., Dirsch, Boris, Ferguson, Harry C., Calzetti, Daniela, Panagia, Nino
We describe a new, direct method for determining the opacity of foreground galaxies which does not require any a priori assumptions about the spatial distribution or the reddening law of the...
Radio Observations of SN 1980K: Evidence for Rapid Presupernova Evolution (1998)
Montes, Marcos J., Van Dyk, Schuyler D., Weiler, Kurt W., Sramek, Richard A., Panagia, Nino
New observations of SN 1980K made with the VLA at 20 and 6 cm from 1994 April through 1996 October show that the supernova (SN) has undergone a significant change in its radio emission evolution,...
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...