The Supermassive Black Hole and Dark Matter Halo of NGC 4649 (M60) (2009)
We apply the axisymmetric orbit superposition modeling to estimate the mass of the supermassive black hole and dark matter halo profile of NGC 4649. We have included data sets from the Hubble Space...
Blanc, Guillermo A., Heiderman, Amanda, Gebhardt, Karl, Evans II, Neal J., Adams, Joshua
We investigate the relation between the star formation rate surface density (Sigma_SFR) and the mass surface density of gas (Sigma_gas) in NGC 5194. VIRUS-P integral field spectroscopy is used to...
The Black Hole Mass, Stellar M/L, and Dark Halo in M87 (2009)
We model the dynamical structure of M87 (NGC4486) using high spatial resolution long-slit observations of stellar light in the central regions, two-dimensional stellar light kinematics out to half of...
Humphrey, Philip J., Buote, David A., Brighenti, Fabrizio, Gebhardt, Karl, Mathews, William G.
We present new mass measurements for the supermassive black holes (SMBHs) in the centres of three early-type galaxies. The gas pressure in the surrounding, hot interstellar medium (ISM) is measured...
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...
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
Globular cluster (GC) spectroscopy is an excellent way to study GC kinematics, ages, and abundances, and galactic dark matter content [5, 2]. Our group is using the Gemini Multi-Object Spectrograph...
Faifer, Favio Raul, Forte, Juan Carlos, Beasley, Michael A., Bridges, Terry J., Forbes, Duncan A., Gebhardt, Karl, ...
Globular clusters (GCs) are useful tools to study the star formation and chemical evolution history as well as the dynamics and dark matter content of early-type galaxies. In this context, our group...
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
Globular cluster (GC) spectroscopy is an excellent way to study GC kinematics, ages, and abundances, and galactic dark matter content [5, 2]. Our group is using the Gemini Multi-Object Spectrograph...
Faifer, Favio Raul, Forte, Juan Carlos, Beasley, Michael A., Bridges, Terry J., Forbes, Duncan A., Gebhardt, Karl, ...
Globular clusters (GCs) are useful tools to study the star formation and chemical evolution history as well as the dynamics and dark matter content of early-type galaxies. In this context, our group...
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...
Hobby-Eberly Telescope Observations of the Dark Halo in NGC 821 (2008)
Forestell, Amy, Gebhardt, Karl
The best constraints on dark halo properties of elliptical galaxies come from large radii; however, observations at these radii are difficult due to the faint stellar light and/or sparse kinematic...
Weighing the Quiescent Central Black Hole in an Elliptical Galaxy with X-ray Emitting Gas (2008)
Humphrey, Philip J., Buote, David A., Brighenti, Fabrizio, Gebhardt, Karl, Mathews, William G.
We present a Chandra study of the hot ISM in the giant elliptical galaxy NGC4649. In common with other group-centred ellipticals, its temperature profile rises with radius in the outer parts of the...
Noyola, Eva, Gebhardt, Karl, Bergmann, Marcel
The globular cluster omega Centauri is one of the largest and most massive members of the galactic system. However, its classification as a globular cluster has been challenged making it a candidate...
Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923 (2008)
Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, ...
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This...
Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923 (2008)
Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, ...
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This...
Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923 (2008)
Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, ...
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This...
Hill, Gary J., Gebhardt, Karl, Komatsu, Eiichiro, Drory, Niv, MacQueen, Phillip J., Adams, Josh, ...
Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923 (2008)
Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, ...
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This...
Gemini/GMOS Spectroscopy of the Spheroid and Globular Cluster System of NGC 3923 (2007)
Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, ...
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This...
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 QUADRUPLE GRAVITATIONAL LENS PG 11151080: TIME DELAYS AND MODELS (2007)
Paul L. Schechter, Charles D. Bailyn, Robert Barr, Richard Barvainis, Christopher M. Becker, Gary M. Bernstein, ...
12 TODD HURT,
Paul L. Schechter, Charles D. Bailyn, Robert Barr, Richard Barvainis, Christopher M, John P. Blakeslee, ...
Robert A. Fesen 9, Phillipe Fischer
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...
Surface Brightness Profiles for a sample of LMC, SMC and Fornax galaxy Globular Clusters (2007)
We use Hubble Space Telescope archival images to measure central surface brightness profiles of globular clusters around satellite galaxies of the Milky Way. We report results for 21 clusters around...
The VIRUS emission line detection recipe (2007)
Gössl, Claus A., Hopp, Ulrich, Köhler, Ralf, Grupp, Frank, Relke, Helena, Drory, Niv, ...
Wolf, Marsha J., Drory, Niv, Gebhardt, Karl, Hill, Gary J.
Spectra of galaxies contain an enormous amount of information about the relative mixture of ages and metallicities of constituent stars. We present a comprehensive study designed to extract the...
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...
Probing Dark Energy with Baryonic Acoustic Oscillations at High Redshifts (2006)
Koehler, Ralf S., Schuecker, Peter, Gebhardt, Karl
The phases as well as the amplitudes of baryonic acoustic oscillations can be extracted out of a galaxy power spectrum and used as a standard ruler in a cosmological test. A non-oscillating...
HST Proper Motions and Stellar Dynamics in the Core of the Globular Cluster 47 Tucanae (2006)
McLaughlin, Dean E., Anderson, Jay, Meylan, Georges, Gebhardt, Karl, Pryor, Carlton, Minniti, Dante, ...
We have used HST imaging of the central regions (R
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...
Shapiro, Kristen L., Cappellari, Michele, De Zeeuw, Tim, McDermid, Richard M., Gebhardt, Karl, ...
We combine Hubble Space Telescope spectroscopy and ground-based integral-field data from the SAURON and OASIS instruments to study the central black hole in the nearby elliptical galaxy NGC 3379....
The DEEP Groth Strip Survey VI. Spectroscopic, Variability, and X-ray Detection of AGN (2006)
Sarajedini, Vicki L., Koo, David C., Phillips, Andrew C., Kobulnicky, Henry A., Gebhardt, Karl, Willmer, Christopher N. A., ...
We identify active galactic nuclei (AGN) in the Groth-Westphal Survey Strip (GSS) using the independent and complementary selection techniques of optical spectroscopy and photometric variability. We...
Gemini/GMOS Spectra of Globular Clusters in the Virgo Giant Elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS spectra for 38 GCs associated with this galaxy. Applying the multi-index chi^2 minimisation technique of...
The VIRUS data reduction pipeline (2006)
Goessl, Claus A., Drory, Niv, Relke, Helena, Gebhardt, Karl, Grupp, Frank, Hill, Gary, ...
Shapiro, Kristen L., Cappellari, Michele, De Zeeuw, Tim, McDermid, Richard M., Gebhardt, Karl, ...
We combine Hubble Space Telescope spectroscopy and ground-based integral-field data from the SAURON and OASIS instruments to study the central black hole in the nearby elliptical galaxy NGC 3379....
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60) (2006)
Bridges, Terry, Gebhardt, Karl, Sharples, Ray, Faifer, Favio R., Forte, Juan C., Beasley, Michael A., ...
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649...
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 (2006)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio R., ...
Abstract not available.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this...
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 (2006)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio R., ...
Abstract not available.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this...
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60) (2006)
Bridges, Terry, Gebhardt, Karl, Sharples, Ray, Faifer, Favio R., Forte, Juan C., Beasley, Michael A., ...
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649...
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 (2006)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio R., ...
Abstract not available.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this...
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60) (2006)
Bridges, Terry, Gebhardt, Karl, Sharples, Ray, Faifer, Favio R., Forte, Juan C., Beasley, Michael A., ...
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649...
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60) (2006)
Bridges, Terry, Gebhardt, Karl, Sharples, Ray, Faifer, Favio R., Forte, Juan C., Beasley, Michael A., ...
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649...
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 (2006)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio R., ...
Abstract not available.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this...
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60) (2006)
Bridges, Terry, Gebhardt, Karl, Sharples, Ray, Faifer, Favio R., Forte, Juan C., Beasley, Michael A., ...
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649...
Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 (2006)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio R., ...
Abstract not available.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649 (2006)
Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, ...
NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this...
The dynamical M/L-profile and distance of the globular cluster M15 (2005)
Bosch, Remco Van Den, De Zeeuw, Tim, Gebhardt, Karl, Noyola, Eva, Van De Ven, Glenn
We construct orbit-based axisymmetric dynamical models for the globular cluster M15 which fit groundbased line-of-sight velocities and Hubble Space Telescope line-of-sight velocities and proper...
Gemini/GMOS Spectra of Globular Clusters in the Leo Group Elliptical NGC 3379 (2005)
Pierce, Michael, Beasley, Michael A., Forbes, Duncan A., Bridges, Terry, Gebhardt, Karl, Faifer, Favio Raul, ...
We have obtained Gemini/GMOS spectra for 22 GCs associated with NGC 3379. We derive ages, metallicities and alpha-element abundance ratios from simple stellar population models using the multi-index...
Gebhardt, Karl, Rich, R. Michael, Ho, Luis C.
We present dynamical models for the massive globular cluster G1. The goal is to measure or place a significant upper limit on the mass of any central black hole. Whether or not globular clusters...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
The DEEP Groth Strip Survey. I. The Sample (2005)
Vogt, Nicole P., Koo, David C., Phillips, Andrew C., Wu, Katherine, Faber, S. M., Willmer, Christopher N. A., ...
The Deep Extragalactic Exploratory Probe (DEEP) is a multi-phase research program dedicated to the study of the formation and evolution of galaxies and of large scale structure in the distant...
Silge, Julia D., Gebhardt, Karl, Bergmann, Marcel, Richstone, Douglas
The infrared spectrograph GNIRS on Gemini South unlocks new possibilities to study the central black holes in dusty galaxies that have been inaccessible to previous black hole studies. We exploit...
The DEEP groth strip survey. VIII. The evolution of luminous field bulges at redshift z ~ 1 (2005)
Koo, David C., Simard, Luc, Willmer, Christopher N. A., Gebhardt, Karl, Bouwens, Rychard J., Kauffmann, Guinevere, ...
The DEEP Groth strip galaxy redshift survey. III. Redshift catalog and properties of galaxies (2005)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
The DEEP Groth strip galaxy redshift survey. III. Redshift catalog and properties of galaxies (2005)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
The DEEP Groth strip galaxy redshift survey. III. Redshift catalog and properties of galaxies (2005)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We...
Globular clusters in early-type galaxies with GMOS (2005)
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
Abstract not available.
The DEEP Groth strip galaxy redshift survey. III. Redshift catalog and properties of galaxies (2005)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
Globular clusters in early-type galaxies with GMOS (2005)
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
Abstract not available.
Globular clusters in early-type galaxies with GMOS (2005)
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
Abstract not available.
Nicole P. Vogt, David C. Koo, Andrew C. Phillips, Katherine Wu, S. M. Faber, ...
The Deep Extragalactic Exploratory Probe (DEEP) is a multi-phase research program dedicated to the study of the formation and evolution of galaxies and of large scale structure in the distant...
Globular clusters in early-type galaxies with GMOS (2005)
Bridges, Terry J., Beasley, Michael A., Faifer, Favio Raul, Forbes, Duncan A., Forte, Juan Carlos, Gebhardt, Karl, ...
We present recent results from our long-term Gemini/GMOS study of globular clusters in early-type galaxies. To date, we have obtained photometry and spectroscopy for clusters in NGCs 3379, 4649, 524,...
The DEEP Groth strip galaxy redshift survey. III. Redshift catalog and properties of galaxies (2005)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We...
Spatially resolved stellar populations in the isolated elliptical NGC 821 (2005)
Proctor, Robert N., Forbes, Duncan A., Forestell, Amy, Gebhardt, Karl
We present the analysis of Lick absorption-line indices from three separate long-slit spectroscopic observations of the nearby isolated elliptical galaxy NGC 821. The three data sets present a...
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...
Koo, David C., Simard, Luc, Willmer, Christopher N. A., Gebhardt, Karl, Bouwens, Rychard J., Kauffmann, Guinevere, ...
We present a sample of over 50 luminous field bulges (including ellipticals) found in the Groth Strip Survey (GSS), with 0.73< z < 1.04 and with bulge magnitudes I
The DEEP Groth Strip Galaxy Redshift Survey. III. Redshift Catalog and Properties of Galaxies (2004)
Weiner, Benjamin J., Phillips, Andrew C., Faber, S. M., Willmer, Christopher N. A., Vogt, Nicole P., Simard, Luc, ...
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at the properties and clustering of galaxies at redshifts z ~ 1. We present the...
Gemini/GMOS Imaging of Globular Clusters in the Virgo Galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio Raul, Forte, Juan Carlos, Bridges, Terry, Beasley, Michael A., Gebhardt, Karl, ...
We present Sloan g and i imaging from the GMOS instrument on the Gemini North telescope for the globular cluster (GC) system around the Virgo galaxy NGC 4649 (M60). Our three pointings, taken in good...
The Relationship Between Black Hole Mass and Velocity Dispersion in Seyfert 1 Galaxies (2004)
Nelson, Charles H., Green, Richard F., Bower, Gary, Gebhardt, Karl, Weistrop, Donna
Black hole masses in active galactic nuclei (AGN) are difficult to measure using conventional dynamical methods, but can be determined using the technique of reverberation mapping. However, it is...
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...
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio R., Forte, Juan C., Bridges, Terry J., Beasley, Michael A., Gebhardt, Karl, ...
Not available.
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio R., Forte, Juan C., Bridges, Terry J., Beasley, Michael A., Gebhardt, Karl, ...
Not available.
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio R., Forte, Juan C., Bridges, Terry J., Beasley, Michael A., Gebhardt, Karl, ...
Not available.
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio R., Forte, Juan C., Bridges, Terry J., Beasley, Michael A., Gebhardt, Karl, ...
Not available.
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60) (2004)
Forbes, Duncan A., Faifer, Favio R., Forte, Juan C., Bridges, Terry J., Beasley, Michael A., Gebhardt, Karl, ...
Not available.
Globular Clusters in Early-Type Galaxies with GMOS (2003)
Bridges, Terry, Beasley, Mike, Faifer, Favio, Forbes, Duncan, Forte, Juan, Gebhardt, Karl, ...
We present recent results from our long-term Gemini/GMOS study of globular clusters in early-type galaxies. To date, we have obtained photometry and spectroscopy for clusters in NGCs 3379, 4649, 524,...
Deep Photometry in a Remote M31 Major Axis Field Near G1 (2003)
Rich, R. Michael, Reitzel, David B., Guhathakurta, Puragra, Gebhardt, Karl, Ho, Luis C.
We present photometry from Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 parallel imagery of a remote M31 field at a projected distance of about 34 kpc from the nucleus near the SW major...
The DEEP Groth Strip Survey IX: Evolution of the Fundamental Plane of Field Galaxies (2003)
Gebhardt, Karl, Faber, S. M., Koo, David C., Im, Myungshin, Simard, Luc, Illingworth, Garth D., ...
Fundamental Plane studies provide an excellent means of understanding the evolutionary history of early-type galaxies. Using the Low Resolution Imaging Spectrograph on the Keck telescope, we obtained...
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....
Influence of Black Holes on Stellar Orbits (2003)
We review the current state of dynamical modeling for galaxies in terms of being able to measure both the central black hole mass and stellar orbital structure. Both of these must be known adequately...
Dust and the Infrared Kinematic Properties of Early-Type Galaxies (2003)
Silge, Julia D., Gebhardt, Karl
We have obtained spectra and measured the stellar kinematics in a sample of 25 nearby early-type galaxies (with velocity dispersions from less than 100 km/s to over 300 km/s) using the near-infrared...
"Velocity Dispersion and Black Hole Mass in Seyfert 1 Galaxies" (2003)
Nelson, Charles H., Green, Richard, Bower, Gary, Gebhardt, Karl, Weistrop, Donna
Paper presented at Carnegie Observatories Centennial Symposium I - Coevolution of Black Holes and Galaxies, 20-25 October 2002, Carnegie Observatories, Pasadena, CA.
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...
Gerssen, Joris, Van Der Marel, Roeland P., Gebhardt, Karl, Guhathakurta, Puragra, Peterson, Ruth, Pryor, Carlton
It has been reported that there is an error in the figure in Dull et al. (1997, D97) that shows the radial M/L profile in Fokker-Planck models of M15. We discuss how this modifies the interpretation...
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...
A 20 Thousand Solar Mass Black Hole in the Stellar Cluster G1 (2002)
Gebhardt, Karl, Rich, R. Michael, Ho, Luis
We present the detection of a 2.0(+1.4,-0.8)x10^4 solar mass black hole (BH) in the stellar cluster G1 (Mayall II), based on data taken with the Space Telescope Imaging Spectrograph onboard the...
Van Der Marel, Roeland P., Gerssen, Joris, Guhathakurta, Puragra, Peterson, Ruth, Gebhardt, Karl
In this series of two papers we describe a project with STIS on HST to measure the line-of-sight velocities of stars in the central few arcsec of the dense globular cluster M15. This first paper...
Gerssen, Joris, Van Der Marel, Roeland P., Gebhardt, Karl, Guhathakurta, Puragra, Peterson, Ruth, Pryor, Carlton
We analyze HST/STIS spectra (see Paper I) of the central region of the dense globular cluster M15. We infer the velocities of 64 individual stars, two-thirds of which have their velocity measured for...
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...
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 +...
Surface Brightness Profiles of Galactic Globular Clusters (2002)
We present surface brightness profiles for 28 galactic globular clusters. The profiles come from archival images of the WFPC2 camera on HST using a variety of filters. An important tool for studying...
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...
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(#/#...
The Nuclear Disk in the Dwarf Elliptical Galaxy NGC 4486A (2001)
Kormendy, John, Gebhardt, Karl, Macchetto, F. Duccio, Sparks, W. B.
Many ellipticals contain nuclear disks of dust and gas. Some ellipticals contain nuclear disks of stars that are distinct from the rest of the galaxy. We show that the dwarf E2 galaxy NGC 4486A...
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...
Are There Blue, Massive E/S0s at z < 1 ?: Kinematics of Blue Spheroidal Galaxy Candidates (2001)
Im, Myungshin, Faber, S. M., Gebhardt, Karl, Koo, David C., Phillips, Andrew C., Schiavon, Ricardo P., ...
Several recent studies find that 10 - 50% of morphologically selected field early-type galaxies at redshifts z
Supermassive Black Holes in Nuclei of Galaxies (2001)
Kormendy, John, Gebhardt, Karl
We review the motivation and search for supermassive black holes (BHs) in galaxies. Energetic nuclear activity provides indirect but compelling evidence for BH engines. Ground-based dynamical...
The Spatial Distribution and Kinematics of Stellar Populations in E+A Galaxies (2001)
Norton, Stuart A., Gebhardt, Karl, Zabludoff, Ann I., Zaritsky, Dennis
We use long-slit spectroscopic observations of the sample of E+A galaxies described by Zabludoff et al. to constrain the nature of the progenitors and remnants of the E+A phase of galaxy evolution....
Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics (2000)
Gebhardt, Karl, Kormendy, John, Ho, Luis, Bender, Ralf, Bower, Gary, Dressler, Alan, ...
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)
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...
CFHT Adaptive Optics Observations of the Central Kinematics in M15 (1999)
Gebhardt, Karl, Pryor, Carlton, O'Connell, R. D., Williams, T. B., Hesser, James E.
We have used an Imaging Fabry-Perot Spectrophotometer with the Adaptive Optics Bonnette on the Canada-France-Hawaii Telescope to measure stellar radial velocities in the globular cluster M15. An...
Axisymmetric, 3-Integral Models of Galaxies: A Massive Black Hole in NGC3379 (1999)
Gebhardt, Karl, Richstone, Douglas, Kormendy, John, Lauer, Tod, Ajhar, Edward, Bender, Ralf, ...
We fit axisymmetric 3-integral dynamical models to NGC3379 using the line-of-sight velocity distribution obtained from HST/FOS spectra of the galaxy center and ground-based long-slit spectroscopy...
Kobulnicky, Chip, Gebhardt, Karl
The [O II] lambda3727 emission lines and absorption features from stellar Balmer and Ca H&K lines are the most accessible kinematic diagnotics in galaxies at z~1. We investigate the kinematics of 22...
Globular Cluster Systems I: V-I Color Distributions (1999)
Gebhardt, Karl, Kissler-Patig, Markus
We have compiled data for the globular cluster systems of 50 galaxies from the HST WFPC2 archive, of which 43 are type S0 or earlier. In this paper, we present the data set and derive the V-I color...
The Spin of M87 as measured from the Rotation of its Globular Clusters (1998)
Kissler-Patig, Markus, Gebhardt, Karl
We revisit the kinematical data for 204 globular clusters in the halo of M87. Beyond 3 r_eff along the major axis of the galaxy light, these globular clusters exhibit substantial rotation (~ 300 +/-...
A Framework for Analysing the Hydrolic Condition of Watersheds (1998)
McCammon, Bruce, Rector, John, Gebhardt, Karl
The purpose of this guidance is to provide a national framework for hydrologic analysis and related protocols as components of more comprehensive interdisciplinary watershed analysis. This guidance...
The Demography of Massive Dark Objects in Galaxy Centres (1997)
Magorrian, John, Tremaine, Scott, Richstone, Douglas, Bender, Ralf, Bower, Gary, Dressler, Alan, ...
We construct dynamical models for a sample of 36 nearby galaxies with Hubble Space Telescope photometry and ground-based kinematics. The models assume that each galaxy is axisymmetric, with a...
Spectroscopic Evidence for a Supermassive Black Hole in NGC 4486B (1997)
Kormendy, John, Bender, Ralf, Magorrian, John, Tremaine, Scott, Gebhardt, Karl, Richstone, Douglas, ...
The stellar kinematics of the dwarf elliptical galaxy NGC 4486B have been measured in seeing sigma_* = .22 arcsec with the Canada-France-Hawaii Telescope. Lauer et al. 1996, ApJ, 471, L79 have shown...
Fabry-Perot Observations of Globular Clusters III: M15 (1996)
Gebhardt, Karl, Pryor, Carlton, Williams, T. B., Hesser, James E., Stetson, Peter B.
We have used an Imaging Fabry-Perot Spectrophotometer with the Sub-arcsecond Imaging Spectrograph on the CFHT to measure velocities for 1534 stars in the globular cluster M15. Combined with previous...
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...
Gebhardt, Karl, Richstone, Douglas, Ajhar, Edward, Lauer, Tod, Byun, Yong-Ik, Kormendy, John, ...
We have non-parametrically determined the luminosity density profiles and their logarithmic slopes for 42 early-type galaxies observed with HST. Assuming that the isodensity contours are spheroidal,...
Cluster Dynamics and Cluster Masses (1995)
Merritt, David, Gebhardt, Karl
In spite of the promise of new techniques for constraining the mass distribution in galaxy clusters, much remains to be learned from galaxy orbital velocities. This article reviews the theory of...
Cluster dynamics and cluster masses (1995)
Merritt, David, Gebhardt, Karl
Allso archived in: astro-ph/9510091 18 Oct 1995 AND Rutgers Astrophysics Preprint Series No. 150.
Cluster dynamics and cluster masses (1995)
Merritt, David, Gebhardt, Karl
"Clusters of Galaxies.": Proceedings of the XXIXth Rencontre de Moriond meeting held in Méribel, Savoie, France: 12-19 March 1994.
Non-Parametric Dynamical Analysis of Globular Clusters: M15, 47~Tuc, NGC~362, and NGC~3201 (1994)
Gebhardt, Karl, Fischer, Philippe
We use radial velocities of member stars and cluster surface brightness profiles to non-parametrically determine the mass density profiles and isotropic phase-space distribution functions $f(E)$ for...
Thesis (doctoral)--Technische Universität München, 1981.
Beiträge zur Elektrophysiologie der Tierhaut / (1922)
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