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Accretion and Ejection--The GR/MHD View
J. H. Krolik, J. F. Hawley
The inward flow of matter through accretion disks is driven by MHD turbulence. Global general relativistic MHD simulations shed quantitative light on this process, revealing a numb…
Light Curves from an MHD Simulation of a Black Hole Accretion Disk
Jeremy D. Schnittman, Julian H. Krolik, John F. Hawley
We use a relativistic ray-tracing code to calculate the light curves observed from a global general relativistic magneto-hydrodynamic simulation of an accretion flow onto a Schwarz…
Penetrating the Deep Cover of Compton Thick Active Galactic Nuclei
N. A. Levenson, T. M. Heckman, J. H. Krolik +2
We analyze observations obtained with the Chandra X-ray Observatory of bright Compton thick active galactic nuclei (AGNs), those with column densities in excess of 1.5 x 10^{24} cm…
Estimating the Radiative Efficiency of Magnetized Accretion Disks Around Black Holes
Kris Beckwith, John F. Hawley, Julian H. Krolik
Simulations of black hole accretion have shown that magnetic stresses are present near and inside the innermost stable circular orbit (ISCO). This finding suggests that such flows…
A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Third Data Release
Jonathan R. Trump, Patrick B. Hall, Timothy A. Reichard +9
We present a total of 4784 unique broad absorption line quasars from the Sloan Digital Sky Survey Third Data Release. An automated algorithm was used to match a continuum to each q…
Type II Quasars from the Sloan Digital Sky Survey: V. Imaging host galaxies with the Hubble Space Telescope
Nadia L. Zakamska, Michael A. Strauss, Julian H. Krolik +7
Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this paper we present 3-band HST images of nine type II quasars…
The Weak Field Limit of the Magnetorotational Instability
Julian H. Krolik, Ellen G. Zweibel
We investigate the behavior of the magneto-rotational instability in the limit of extremely weak magnetic field, i.e., as the ratio of ion cyclotron frequency to orbital frequency…
Hosts of Type II Quasars: an HST Study
Nadia L. Zakamska, Michael A. Strauss, Julian H. Krolik +6
Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this contribution we present 3-band HST images of nine type II q…
Magnetic pressure support and accretion disk spectra
O. M. Blaes, S. W. Davis, S. Hirose +2
Stellar atmosphere models of ionized accretion disks have generally neglected the contribution of magnetic fields to the vertical hydrostatic support, although magnetic fields are…