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19 papers
The Black Hole Mass and Photometric Components of NGC 4826
Kayhan Gültekin, Karl Gebhardt, John Kormendy +6
We present IR photometry and HST imaging and spectroscopy of Sab galaxy NGC 4826. Schwarzschild dynamical modeling is used to measure its central black hole mass . Photometric d…
Low-Mass AGN and Their Relation to the Fundamental Plane of Black Hole Accretion
Kayhan Gultekin, Edward M. Cackett, Ashley L. King +2
We put active galactic nuclei (AGNs) with low-mass black holes on the fundamental plane of black hole accretion---the plane that relates X-ray emission, radio emission, and mass of…
Is there a black hole in NGC 4382?
Kayhan Gultekin, Douglas O. Richstone, Karl Gebhardt +5
We present HST STIS observations of the galaxy NGC 4382 (M85) and axisymmetric models of the galaxy to determine mass-to-light ration (M/L, V-band) and central black hole mass (M_B…
A Quintet of Black Hole Mass Determinations
Kayhan Gultekin, Douglas O. Richstone, Karl Gebhardt +11
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…
A Stellar Dynamical Measurement of the Black Hole Mass in the Maser Galaxy NGC 4258
Christos Siopis, Karl Gebhardt, Tod R. Lauer +13
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 hig…
The Black Hole Mass and Extreme Orbital Structure in NGC1399
Karl Gebhardt, Tod R. Lauer, Jason Pinkney +12
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…