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Detecting Compton Reflection and a Broad Iron Line in MCG-5-23-16 with the Rossi X-ray Timing Explorer
K. A. Weaver, J. H. Krolik, E. A. Pier
We report the detection with the Rossi X-ray Timing Explorer of a Compton reflection signature in the Seyfert galaxy MCG-5-23-16. RXTE also resolves the Fe K-alpha fluorescence lin…
The Vertical Structure and Ultraviolet Spectrum of Accretion Disks Heated by Internal Dissipation in Active Galactic Nuclei
Mark W. Sincell, Julian H. Krolik
We present an improved calculation of the vertical structure and ultraviolet spectrum of a dissipative accretion disk in an AGN. We calculate model spectra in which the viscous str…
The Nature of Spectral Transitions in Accreting Black Holes: The Case of Cyg X-1
Juri Poutanen, Julian Krolik, Felix Ryde
Accreting black holes radiate in one of several spectral states, switching from one to another for reasons that are as yet not understood. Using the best studied example, Cyg X-1,…
Physical Characteristics of the Spectral States of Galactic Black Holes
Juri Poutanen, Julian H. Krolik, Felix Ryde
Using simple analytical estimates we show how the physical parameters characterizing different spectral states of the galactic black hole candidates can be determined using spectra…
HUT Observations of Time-Variable Absorption in NGC 4151
J. H. Krolik, G. A. Kriss
We present the results of ultraviolet spectral monitoring of the Seyfert galaxy NGC 4151 performed by the Hopkins Ultraviolet Telescope during the Astro-2 mission. We show how the…
Non-LTE Models and Theoretical Spectra of Accretion Disks in Active Galactic Nuclei
Ivan Hubeny, Veronika Hubeny
We present self-consistent models of the vertical structure and emergent spectrum of AGN accretion disks. The central object is assumed to be a supermassive Kerr black hole. We dem…
Gamma-ray Emission From Advection-Dominated Accretion Flows Around Black Holes: Application to the Galactic Center
Rohan Mahadevan, Ramesh Narayan, Julian Krolik
We calculate the flux and spectrum of γ-rays emitted by a two-temperature advection-dominated accretion flow (ADAF) around a black hole. The γ-rays are from the decay of neutral pi…
Thermal conduction in accretion disk coronae
Andrzej Maciolek-Niedzwiecki, Julian H. Krolik, Andrzej A. Zdziarski
We study the effects of thermal conduction in a hot, active corona above an accretion disk. We assume that all of the dissipative heating takes place in the corona. We find that th…