RR Lyrae variables in M32 and the disk of M31 (2009)
Fiorentino, Giuliana, Monachesi, Antonela, Trager, Scott C., Lauer, Tod R., Saha, Abhijit, Mighell, Kenneth J., ...
We observed two fields near M32 with the Advanced Camera for Surveys/High Resolution Channel (ACS/HRC) on board the Hubble Space Telescope (HST). The main field, F1, is 1.8 arcmin from the center of...
RR Lyrae Variables in Two Fields in the Spheroid of M31 (2009)
Sarajedini, Ata, Mancone, Conor L., Lauer, Tod R., Dressler, Alan, Freedman, Wendy, Trager, S. C., ...
We present Hubble Space Telescope observations taken with the Advanced Camera for Surveys Wide Field Channel of two fields near M32—between 4 and 6 kpc from the center of M31. The data cover a time...
HST Images and KPNO Spectroscopy of the Binary Black Hole Candidate SDSS J153636.22+044127.0 (2009)
Lauer, Tod R., Boroson, Todd A.
We present HST WFPC2/PC images and KPNO 4-m longslit spectroscopy of the QSO SDSS J153636.22+044127.0, which we advanced as a candidate binary supermassive black hole. The images reveal a close...
RR Lyrae Variables in Two Fields in the Spheroid of M31 (2009)
Sarajedini, Ata, Mancone, Conor L., Lauer, Tod R., Dressler, Alan, Freedman, Wendy, Trager, S. C., ...
We present Hubble Space Telescope observations taken with the Advanced Camera for Surveys Wide Field Channel of two fields near M32 - between four and six kpc from the center of M31. The data cover a...
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...
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...
A Candidate Sub-Parsec Supermassive Binary Black Hole System (2009)
Boroson, Todd A., Lauer, Tod R.
We identify SDSS J153636.22+044127.0, a QSO discovered in the Sloan Digital Sky Survey, as a promising candidate for a binary black hole system. This QSO has two broad-line emission systems separated...
Color Bimodality in M87 Globular Clusters (2008)
Waters, Christopher Z., Zepf, Stephen E., Lauer, Tod R., Baltz, Edward A.
We present an analysis of a 50 orbit HST ACS observation of the M87 globular cluster system. We use the extraordinary depth of this dataset to test whether the colors and magnitudes show evidence for...
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...
Dissipation and Extra Light in Galactic Nuclei: III. 'Core' Ellipticals and 'Missing' Light (2008)
Hopkins, Philip F., Lauer, Tod R., Cox, Thomas J., Hernquist, Lars, Kormendy, John
We investigate how 'extra' central light in the surface brightness profiles of cusp ellipticals relates to the profiles of ellipticals with cores. Cusp elliptical envelopes are formed by violent...
Dissipation and Extra Light in Galactic Nuclei: II. 'Cusp' Ellipticals (2008)
Hopkins, Philip F., Cox, Thomas J., Dutta, Suvendra N., Hernquist, Lars, Kormendy, John, Lauer, Tod R.
We study the origin and properties of 'extra' or 'excess' central light in the surface brightness profiles of cusp or power-law ellipticals. Dissipational mergers give rise to two-component profiles:...
Axisymmetric, 3-Integral Models of Galaxies: A Massive Black Hole in NGC 3379 (2007)
Karl Gebhardt, Douglas Richstone, John Kormendy, Tod R. Lauer, Edward A. Ajhar, Ralf Bender, ...
We fit axisymmetric, 3-integral dynamical models to NGC 3379 using HST/FOS spectra of the galaxy center and ground-based long-slit spectroscopy along four position angles, with the light distribution...
The Photometry of Undersampled Point Spread Functions (2007)
Tod Lauer National, Tod R. Lauer
An undersampled point spread function may interact with the microstructure of a solid-state detector such that the total flux detected can depend sensitively on where the PSF center falls within a...
The Black Hole Mass and Extreme Orbital Structure in NGC1399 (2007)
Gebhardt, Karl, Lauer, Tod R., Pinkney, Jason, Bender, Ralf, Richstone, Douglas, Aller, Monique, ...
The largest galaxies, and in particular central galaxies in clusters, offer unique insight into understanding the mechanism for the growth of nuclear black holes. We present Hubble Space Telescope...
Lauer, Tod R., Tremaine, Scott, Richstone, Douglas, Faber, S. M.
Programs to observe evolution in the Mbh-sigma or Mbh-L relations typically compare black-hole masses, Mbh, in high-redshift galaxies selected by nuclear activity to Mbh in local galaxies selected by...
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...
Destiny: A Candidate Architecture for the Joint Dark Energy Mission (2006)
Benford, Dominic J., Lauer, Tod R.
Destiny is a simple, direct, low cost mission to determine the properties of dark energy by obtaining a cosmologically deep supernova (SN) type Ia Hubble diagram. Operated at L2, its science...
Luminosity Function of Faint Globular Clusters in M87 (2006)
Waters, Christopher Z., Zepf, Stephen E., Lauer, Tod R., Baltz, Edward A., Silk, Joseph
We present the luminosity function to very faint magnitudes for the globular clusters in M87, based on a 30 orbit \textit{Hubble Space Telescope (HST)} WFPC2 imaging program. The very deep images and...
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...
Bender, Ralf, Kormendy, John, Bower, Gary, Green, Richard, Thomas, Jens, Danks, Anthony C., ...
We present HST spectroscopy of the nucleus of M31 obtained with STIS. Spectra taken around the CaT lines at 8500 see only the red giants in the double bright- ness peaks P1 and P2. In contrast,...
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...
Sakai, Shoko, Madore, Barry F., Freedman, Wendy L., Lauer, Tod R., Ajhar, Edward A., Baum, William A.
We report the unambiguous detection of individually resolved stars in the elliptical galaxy NGC 3379, a luminous member of the Leo I Group.
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...
E+A Galaxies and the Formation of Early Type Galaxies at z~0 (2004)
Yang, Yujin, Zabludoff, Ann I., Zaritsky, Dennis, Lauer, Tod R., Mihos, J. Christopher
We present HST/WFPC2 observations of the five bluest E+A galaxies (z~0.1) in the Zabludoff et al. sample to study whether their detailed morphologies are consistent with late-to-early type evolution...
An Erupting Classical Nova in a Globular Cluster of M87 (2004)
Shara, Michael M., Zurek, David R., Baltz, Edward A., Lauer, Tod R., Silk, Joseph
Only one certain classical nova eruption has ever been detected inside a globular cluster - nova 1860 A.D. (T Sco) in M80. During a survey of M87 we have detected an erupting star coincident (to...
Microlensing Candidates in M87 and the Virgo Cluster with the Hubble Space Telescope (2003)
Baltz, Edward A., Lauer, Tod R., Zurek, David R., Gondolo, Paolo, Shara, Michael M., Silk, Joseph, ...
The position of the giant elliptical galaxy M87 at the center of the Virgo Cluster means that the inferred column density of dark matter associated with both the cluster halo and the galaxy halo is...
Red Galaxy Clustering in the NOAO Deep Wide-Field Survey (2003)
Brown, Michael J. I., Dey, Arjun, Jannuzi, Buell T., Lauer, Tod R., Tiede, Glenn P., Mikles, Valerie J.
We have measured the clustering of z1000 galaxies to be selected as a function of spectral type, absolute magnitude, and photometric redshift. Spectral synthesis models can be used to predict the...
White, Richard L., Helfand, David J., Becker, Robert H., Gregg, Michael D., Postman, Marc, Lauer, Tod R., ...
We present a new sample of 35 quasars selected from the FIRST radio survey and the Deeprange I-band survey (Postman et al. 1998, 2002). A comparison with the FIRST Bright Quasar survey samples...
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...
Hubble Space Telescope Imaging of Brightest Cluster Galaxies (2002)
Laine, Seppo, Van Der Marel, Roeland P., Lauer, Tod R., Postman, Marc, O'Dea, Christopher P., Owen, Frazer N.
We used the HST WFPC2 to obtain I-band images of the centers of 81 brightest cluster galaxies (BCGs), drawn from a volume-limited sample of nearby BCGs. The images show a rich variety 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...
Deconvolution With a Spatially-Variant PSF (2002)
Application of deconvolution algorithms to astronomical images is often limited by variations in PSF structure over the domain of the images. One major difficulty is that Fourier methods can no...
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...
Postman, Marc, Lauer, Tod R., Oegerle, William, Donahue, Megan
We have conducted an automated search for galaxy clusters within a contiguous 16 square degree I-band survey in the north Galactic hemisphere. A matched filter detection algorithm identifies 444...
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 +...
Tod Lauer National, Tod R. Lauer, Karl Gebhardt, Scott Tremaine, Ralf Bender, Gary Bower, ...
We used Hubble Space Telescope 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...
M33: A Galaxy with No Supermassive Black Hole (2001)
Gebhardt, Karl, Lauer, Tod R., Kormendy, John, Pinkney, Jason, Bower, Gary A., Green, Richard, ...
Galaxies that contain bulges appear to contain central black holes whose masses correlate with the velocity dispersion of the bulge. We show that no corresponding relationship applies in the pure...
The Infrared Surface Brightness Fluctuation Hubble Constant (2000)
Jensen, Joseph B., Tonry, John L., Thompson, Rodger I., Ajhar, Edward A., Lauer, Tod R., Rieke, Marcia J., ...
We measured infrared surface brightness fluctuation (SBF) distances to an isotropically-distributed sample of 16 distant galaxies with redshifts reaching 10,000 km/s using the near-IR camera and...
Observational Constraints on Higher Order Clustering up to $z\simeq 1 (2000)
Szapudi, István, Postman, Marc, Lauer, Tod R., Oegerle, William
Constraints on the validity of the hierarchical gravitational instability theory and the evolution of biasing are presented based upon measurements of higher order clustering statistics in the...
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...
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...
A Relationship Between Nuclear Black Hole Mass And Galaxy Velocity Dispersion (2000)
Karl Gebhardt, Ralf Bender, Alan Dressler, S. M. Faber, Alexei V, Richard Green, ...
We describe a correlation between the mass M of a galaxy's central black hole and the luminosity-weighted line-of-sight velocity dispersion e within the half-light radius. The result is based on...
The Photometry of Undersampled Point Spread Functions (1999)
An undersampled point spread function may interact with the microstructure of a solid-state detector such that the total flux detected can depend sensitively on where the PSF center falls within a...
Combining Undersampled Dithered Images (1998)
Undersampled images, such as those produced by the HST WFPC-2, misrepresent fine-scale structure intrinsic to the astronomical sources being imaged. Analyzing such images is difficult on scales close...
Lauer, Tod R., Faber, S. M., Ajhar, Edward A., Grillmair, Carl J., Scowen, Paul A.
WFPC-2 images are used to study the central structure of M31, M32, and M33. The dimmer peak, P2, of the M31 double nucleus is centered on the bulge to 0.1", implying that it is the dynamical center...
Clustering at High Redshift: Precise Constraints from a Deep, Wide Area Survey (1998)
Postman, Marc, Lauer, Tod R., Szapudi, Istvan, Oegerle, William
We present constraints on the evolution of large-scale structure from a catalog of 710,000 galaxies with I_AB
Clustering at High Redshift: Observational Constraints from a Deep, Wide Area Survey (1998)
Marc Postman, A. Fontana, E. Giallongo, Tod R. Lauer, William Oegerle
. We present constraints on the evolution of large-scale structure from a catalog of 710,000 galaxies with I AB 24. The catalog is derived from a CCD imaging survey of a contiguous 4 ffi \Theta 4 ffi...
The Far Field Hubble Constant (1997)
Lauer, Tod R., Tonry, John L., Postman, Marc, Ajhar, Edward A., Holtzman, Jon A.
We used HST to obtain surface brightness fluctuation (SBF) observations of four nearby brightest cluster galaxies (BCG) to calibrate the BCG Hubble diagram of Lauer & Postman (1992). This BCG Hubble...
The Nuclear Region of M51 Imaged with the HST Planetary Camera (1996)
Grillmair, Carl J., Faber, S. M., Lauer, Tod R., Hester, J. J., Lynds, C. R., O'Neil, E. J., ...
We present high-resolution, broad- and narrow-band, pre-refurbishment images of the central region of M51 taken with the Planetary Camera of the Hubble Space Telescope. The V-band images show a...
The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations (1996)
Faber, S. M., Tremaine, Scott, Ajhar, Edward A., Byun, Yong-Ik, Dressler, Alan, Gebhardt, Karl, ...
We analyze Hubble Space Telescope surface-brightness profiles of 61 elliptical galaxies and spiral bulges (hot galaxies). Luminous hot galaxies have cuspy cores with steep outer power-law profiles...
Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram (1996)
Grillmair, Carl J., Lauer, Tod R., Worthey, Guy, Faber, S. M., Freedman, Wendy L., Madore, Barry F., ...
We present a V-I color-magnitude diagram for a region 1'-2' from the center of M32 based on Hubble Space Telescope WFPC2 images. The broad color-luminosity distribution of red giants shows that the...
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Hubble Space Telescope Planetary Camera Images of NGC 1316 (1996)
Shaya, Edward J., Dowling, Daniel M., Currie, Douglas G., Faber, S. M., Ajhar, Edward A., Lauer, Tod R., ...
We present HST Planetary Camera V and I~band images of the central region of the peculiar giant elliptical galaxy NGC 1316. The inner profile is well fit by a nonisothermal core model with a core...
Brightest Cluster Galaxy Profile Shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell Brightest Cluster Galaxies (BCG), finding a generalised deVaucouleurs R^{1/n} law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....
Brightest cluster galaxy profile shapes (1996)
Graham, Alister, Lauer, Tod R., Colless, Matthew, Postman, Marc
We model the surface brightness profiles of a sample of 119 Abell brightest cluster galaxies (BCGs), finding a generalized de Vaucouleurs R^1/n^ law, where n is a free parameter, to be appropriate....