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Now showing items 1-9 of 9

In Search Of The Largest Velocity Dispersion Galaxies

Salviander, Sarah; Shields, Gregory A.; Gebhardt, Karl; Bernardi, M.; Hyde, J. B. (2008-11)

We present Hobby-Eberly Telescope (HET) observations for galaxies at redshift z < 0:3 from the Sloan Digital Sky Survey (SDSS) showing large velocity dispersions while appearing to be single galaxies in HSTimages. The high ...

Gemini And Hubble Space Telescope Evidence For An Intermediate-Mass Black Hole In Omega Centauri

Noyola, Eva; Gebhardt, Karl; Bergmann, Marcel (2008-04)

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 for being the stripped ...

A Quintet Of Black Hole Mass Determinations

Gueltekin, Kayhan; Richstone, Douglas O.; Gebhardt, Karl; Lauer, Tod R.; Pinkney, Jason; Aller, Monique C.; Bender, Ralf; Dressler, Alan; Faber, S. M.; Filippenko, Alexei V.; Green, Richard; Ho, Luis C.; Kormendy, John; Siopis, Christos (2009-04)

We report five new measurements of central black hole masses based on Space Telescope Imaging Spectrograph and Wide Field Planetary Camera 2 observations with the Hubble Space Telescope (HST) and on axisymmetric, three-integral, ...

The Black Hole Mass And The Stellar Ring In NGC 3706

Gultekin, Kayhan; Gebhardt, Karl; Kormendy, John; Lauer, Tod R.; Bender, Ralf; Tremaine, Scott; Richstone, Douglas O. (2014-02)

We determine the mass of the nuclear black hole (M) in NGC 3706, an early-type galaxy with a central surface brightness minimum arising from an apparent stellar ring, which is misaligned with respect to the galaxy's major ...

Hydrostatic Gas Constraints On Supermassive Black Hole Masses: Implications For Hydrostatic Equilibrium And Dynamical Modeling In A Sample Of Early-Type Galaxies

Humphrey, Phillip J.; Buote, David A.; Brighenti, Fabrizio; Gebhardt, Karl; Mathews, William G. (2009-10)

We present new mass measurements for the supermassive black holes (SMBHs) in the centers of three early-type galaxies. The gas pressure in the surrounding, hot interstellar medium (ISM) is measured through spatially resolved ...

Is There A Black Hole In NGC 4382?

Gultekin, Kayhan; Richstone, Douglas O.; Gebhardt, Karl; Faber, S. M.; Lauer, Tod R.; Bender, Ralf; Kormendy, John; Pinkney, Jason (2011-11)

We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the galaxy NGC 4382 (M85) and axisymmetric models of the galaxy to determine mass-to-light ratio (Gamma(V)) and central black ...

The M-Sigma And M-L Relations In Galactic Bulges, And Determinations Of Their Intrinsic Scatter

Gultekin, Kayhan; Richstone, Douglas O.; Gebhardt, Karl; Lauer, Tod R.; Tremaine, Scott; Aller, Monique C.; Bender, Ralf; Dressler, Alan; Faber, S. M.; Filippenko, Alexei V.; Green, Richard; Ho, Luis C.; Kormendy, John; Magorrian, John; Pinkney, Jason; Siopis, Christos (2009-06)

We derive improved versions of the relations between supermassive black hole mass (MBH) and host-galaxy bulge velocity dispersion (sigma) and luminosity (L; the M-sigma and M-L relations), based on 49 M-BH measurements and ...

Effect Of A Dark Matter Halo On The Determination Of Black Hole Masses

Schulze, Andreas; Gebhardt, Karl (2011-03)

Stellar dynamical modeling is a powerful method to determine the mass of black holes in quiescent galaxies. However, in previous work the presence of a dark matter halo has been ignored in the modeling. Gebhardt & Thomas ...

Very Large Telescope Kinematics for Omega Centauri: Further Support for A Central Black Hole

Noyola, Eva; Gebhardt, Karl; Kissler-Patig, Markus; Lutzgendorf, Nora; Jalali, Behrang; de Zeeuw, P. T.; Baumgardt, Holger (2010-08)

The Galactic globular cluster. Centauri is a prime candidate for hosting an intermediate- mass black hole. Recent measurements lead to contradictory conclusions on this issue. We use VLT- FLAMES to obtain new integrated ...