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SDSSJ092712.65+294344.0: NGC 1275 at z=0.7?
Timothy M. Heckman, Julian H. Krolik, Sean M. Moran +2
SDSSJ092712.65+294344.0 was identified by the SDSS as a quasar, but has the unusual property of having two emission line systems offset by 2650 km/s. One of these contains the usua…
Radiation-Dominated Disks Are Thermally Stable
Shigenobu Hirose, Julian H. Krolik, Omer Blaes
When the accretion rate is more than a small fraction of Eddington, the inner regions of accretion disks around black holes are expected to be radiation-dominated. However, in the…
Direct calculation of the radiative efficiency of an accretion disk around a black hole
Scott C. Noble, Julian H. Krolik, John F. Hawley
Numerical simulation of magnetohydrodynamic (MHD) turbulence makes it possible to study accretion dynamics in detail. However, special effort is required to connect inflow dynamics…
Mid-infrared spectra of optically selected type 2 quasars
Nadia L. Zakamska, Laura Gomez, Michael A. Strauss +1
Type 2 quasars are luminous Active Galactic Nuclei whose central engines are seen through large amounts of gas and dust. We present Spitzer spectra of twelve type 2 quasars selecte…
Detailed Atmosphere Model Fits to Disk-Dominated ULX Spectra
Y. Hui, Julian H. Krolik
We have chosen 6 Ultra-Luminous X-ray sources from the {\it XMM-Newton} archive whose spectra have high signal-to-noise and can be fitted solely with a disk model without requiring…
Radiation Pressure Supported AGN Tori with Hard X-Ray and Stellar Heating
Jiming Shi, Julian H. Krolik
The dynamics and structure of toroidal obscuration around AGN remain uncertain and controversial. In this paper we extend earlier work on the dynamical role of infrared radiation p…
The Infrared Afterglow of Supermassive Black Hole Mergers
Jeremy D. Schnittman, Julian H. Krolik
We model the spectra and light curves of circumbinary accretion disks during the time after the central black holes merge. The most immediate effect of this merger is the dissipati…
Measuring the Fraction of Obscured Quasars by the Infrared Luminosity of Unobscured Quasars
Ezequiel Treister, Julian H. Krolik, Cornelis Dullemond
Recent work has suggested that the fraction of obscured AGN declines with increasing luminosity, but it has been difficult to quantify this trend. Here, we attempt to measure this…
Where is the Radiation Edge in Magnetized Black Hole Accretion discs?
Kris Beckwith, John Hawley, Julian Krolik
General Relativistic (GR) Magnetohydrodynamic (MHD) simulations of black hole accretion find significant magnetic stresses near and inside the innermost stable circular orbit (ISCO…
Space density of optically-selected type 2 quasars
Reinabelle Reyes, Nadia L. Zakamska, Michael A. Strauss +6
Type 2 quasars are luminous active galactic nuclei (AGN) whose central regions are obscured by large amounts of gas and dust. In this paper, we present a catalog of type 2 quasars…