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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…
X-ray and Radio Constraints on the Mass of the Black Hole in Swift J164449.3+573451
J. M. Miller, K. Gultekin
Swift J164449.3+573451 is an exciting transient event, likely powered by the tidal disruption of a star by a massive black hole. The distance to the source, its transient nature, a…
Orbit-Based Dynamical Models of the Sombrero Galaxy (NGC 4594)
John R. Jardel, Karl Gebhardt, Juntai Shen +6
We present axisymmetric, orbit-based models to study the central black hole, stellar mass-to-light ratio, and dark matter halo of NGC 4594 (M104, the Sombrero Galaxy). For stellar…
Observational selection effects and the M-sigma relation
Kayhan Gultekin, Scott Tremaine, Abraham Loeb +1
We examine the possibility that the observed relation between black-hole mass and host-galaxy stellar velocity dispersion (the M-sigma relation) is biased by an observational selec…
How important is the dark matter halo for black hole growth?
Marta Volonteri, Priyamvada Natarajan, Kayhan Gultekin
In this paper, we examine if the properties of central black holes in galactic nuclei correlate with their host dark matter halo. We analyze the entire sample of galaxies where bla…
A Distinctive Disk-Jet Coupling in the Seyfert-1 AGN NGC 4051
Ashley L. King, Jon M. Miller, Edward M. Cackett +6
We report on the results of a simultaneous monitoring campaign employing eight Chandra X-ray (0.5-10 keV) and six VLA/EVLA (8.4 GHz) radio observations of NGC 4051 over seven month…
The Black-Hole Mass in M87 from Gemini/NIFS Adaptive Optics Observations
Karl Gebhardt, Joshua Adams, Douglas Richstone +5
We present the stellar kinematics in the central 2" of the luminous elliptical galaxy M87 (NGC 4486), using laser adaptive optics to feed the Gemini telescope integral-field spectr…