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Emission and Absorption in the M87 LINER
B. M. Sabra, J. C. Shields, L. C. Ho +2
The nucleus of M87 displays a LINER spectrum at optical wavelengths, with a nuclear disk of nebulosity that is resolved by the Hubble Space Telescope. We present new results from o…
Axisymmetric Dynamical Models of the Central Regions of Galaxies
Karl Gebhardt, Douglas Richstone, Scott Tremaine +12
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 Study of the Direct-Fitting Method for Measurement of Galaxy Velocity Dispersions
A. J. Barth, L. C. Ho, W. L. W. Sargent
We have measured the central stellar velocity dispersions of 33 nearby spiral and elliptical galaxies, using a straightforward template-fitting algorithm operating in the pixel dom…
The Black Hole Masses and Host Galaxies of BL Lac Objects
A. J. Barth, L. C. Ho, W. L. W. Sargent
We have measured the central stellar velocity dispersion in the host galaxies of 11 BL Lac objects with redshifts z <= 0.125. The range of velocity dispersions, 170-370 km/s, is si…
A 20 Thousand Solar Mass Black Hole in the Stellar Cluster G1
Karl Gebhardt, R. Michael Rich, Luis Ho
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 Spectrograp…
Search for ultraluminous X-ray sources in nearby galaxies
L. Foschini, G. Di Cocco, L. C. Ho +9
Little is presently known about the nature of ultraluminous X-ray sources (ULX). Different hypotheses have been proposed to explain their properties: intermediate-mass BHs, Kerr BH…