257 citations · 1.7k across the 29 of their papers we have counts for
11 papers · 2 filters
Multi-Temperature Blackbody Spectrum of a Thin Accretion Disk around a Kerr Black Hole: Model Computations and Comparison with Observations
Li-Xin Li, Erik R. Zimmerman, Ramesh Narayan +1
We use a ray-tracing technique to compute the observed spectrum of a thin accretion disk around a Kerr black hole. We include all relativistic effects such as frame-dragging, Doppl…
Bypass to Turbulence in Hydrodynamic Accretion: Lagrangian Analysis of Energy Growth
Niayesh Afshordi, Banibrata Mukhopadhyay, Ramesh Narayan
Despite observational evidence for cold neutral astrophysical accretion disks, the viscous process which may drive the accretion in such systems is not yet understood. While molecu…
Bypass to Turbulence in Hydrodynamic Accretion Disks: An Eigenvalue Approach
Banibrata Mukhopadhyay, Niayesh Afshordi, Ramesh Narayan
Cold accretion disks such as those in star-forming systems, quiescent cataclysmic variables, and some active galactic nuclei, are expected to have neutral gas which does not couple…
Low-Luminosity Accretion in Black Hole X-ray Binaries and Active Galactic Nuclei
Ramesh Narayan
At luminosities below a few percent of Eddington, accreting black holes switch to a hard spectral state which is very different from the soft blackbody-like spectral state that is…
Inclination Effects and Beaming in Black Hole X-ray Binaries
Ramesh Narayan, Jeffrey E. McClintock
We investigate the dependence of observational properties of black hole X-ray binaries on the inclination angle i of their orbits. We find the following: (1) Transient black hole b…
Theoretical Models of Superbursts on Accreting Neutron Stars
Randall L. Cooper, Ramesh Narayan
We carry out a general-relativistic global linear stability analysis of the amassed carbon fuel on the surface of an accreting neutron star to determine the conditions under which…