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Magellan Spectroscopy of Low-Redshift Active Galactic Nuclei
Luis C. Ho, Minjin Kim
We present an atlas of moderate-resolution (R ~ 1200-1600) optical spectra of 94 low-redshift (z < 0.5) active galactic nuclei taken with the Magellan 6.5 m Clay Telescope. The spe…
The Growth of Black Holes: Insights From Obscured Active Galaxies
Jenny E. Greene, Nadia L. Zakamska, Xin Liu +2
Obscured or narrow-line active galaxies offer an unobstructed view of the quasar environment in the presence of a luminous and vigorously accreting black hole. We exploit the large…
A Search for "Dwarf" Seyfert Nuclei. VII. A Catalog of Central Stellar Velocity Dispersions of Nearby Galaxies
Luis C. Ho, Jenny E. Greene, Alexei V. Filippenko +1
We present new central stellar velocity dispersion measurements for 428 galaxies in the Palomar spectroscopic survey of bright, northern galaxies. Of these, 142 have no previously…
Episodic Random Accretion and the Cosmological Evolution of Supermassive Black Hole Spins
J. -M. Wang, C. Hu, Y. -R. Li +7
The growth of supermassive black holes (BHs) located at the centers of their host galaxies comes mainly from accretion of gas, but how to fuel them remains an outstanding unsolved…
X-ray Properties of Intermediate-Mass Black Holes in Active Galaxies. II. X-ray-Bright Accretion and Possible Evidence for Slim Disks
Louis-Benoit Desroches, Jenny E. Greene, Luis C. Ho
We present X-ray properties of optically-selected intermediate-mass (~10^5--10^6 M_Sun) black holes (BHs) in active galaxies (AGNs), using data from the Chandra X-Ray Observatory.…
What controls the Fe II strength in active galactic nuclei?
Xiaobo Dong, Jianguo Wang, Luis C. Ho +5
We used a large, homogeneous sample of 4178 z <= 0.8 Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the strength of Fe II emission and its co…
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…