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Supermassive black hole mass measurements for NGC 1300 and NGC 2748 based on HST [Hubble Space Telescope] emission-line gas kinematics
(Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2005-05)
We present Space Telescope Imaging Spectrograph emission-line spectra of the central regions of the spiral galaxies NGC 1300 and NGC 2748. From the derived kinematics of the nuclear gas we have found evidence for central ...
The supermassive black hole in the Seyfert 2 galaxy NGC 5252
(EDP Sciences: Astronomy & Astrophysics, 2005-02)
We present results from HST/STIS long-slit spectroscopy of the gas motions in the nuclear region of the Seyfert 2 galaxy NGC 5252. The observed velocity field is consistent with gas in regular rotation with superposed ...
Difficulties with recovering the masses of supermassive black holes from stellar kinematical data
(Astrophysical Journal, 2004-02-10)
We investigate the ability of three-integral, axisymmetric, orbit-based modeling algorithms to recover the parameters defining the gravitational potential (mass-to-light ratio and black hole mass M•) in spheroidal stellar ...
Black hole masses in three Seyfert galaxies
(University of Chicago Press: Astrophysical Journal, 2003-03-01)
We analyze published reverberation mapping data for three Seyfert galaxies (NGC 3227, NGC 3516, and NGC 4593) to refine the mass estimate for the supermassive black hole in the center of each object. Treatment of the data ...
Hubble Space Telescope imaging of brightest cluster galaxies
(University of Chicago Press: Astronomical Journal, 2003-02)
We used the HST WFPC2 to obtain I-band images of the centers of 81 brightest cluster galaxies (BCGs), drawn from a volume-limited sample of nearby BCGs. The images show a rich variety of morphological features, including ...
Observations of the neutral gas and dust in the radio galaxy 3C305
(Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2003-01)
We present MERLIN and Hubble Space Telescope (HST) observations of the central region of the nearby radio galaxy 3C305 and use them to study the gas and dust in this object. TheMERLIN observations are of neutral hydrogen ...
Gas kinematics and the black hole mass at the center of the radio galaxy NGC 4335
(Astronomical Journal, 2002-11)
We investigate the kinematics of the central gas disk of the radio-loud elliptical galaxy NGC 4335, derived from Hubble Space Telescope (HST) long-slit spectroscopic observations of Ha+ [Nii] along three parallel slit ...
HI absorption in the gigamaser galaxy TXS 2226-184 and the relation between HI absorption and water emission
(American Astronomical Society, 2002-07-20)
We report on the discovery of H i in absorption toward the gigamaser galaxy TXS 2226-184 using the Very Large Array. The absorption appears to consist of two components—one with a width of 125 km s^-1 and one broader (420 ...
Triaxial black-hole nuclei
(University of Chicago Press: Astrophysical Journal Letters, 2002-04-01)
We demonstrate that the nuclei of galaxies containing supermassive black holes can be triaxial in shape. Schwarzschild’s method was first used to construct self-consistent orbital superpositions representing nuclei with ...
Galaxy cores as relics of black hole mergers
(Blackwell Pubilshing, 2002-04)
We investigate the hypothesis that the cores of elliptical galaxies and bulges are created from the binding energy liberated by the coalescence of supermassive binary black holes during galaxy mergers. Assuming that the ...