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Thermal X-Ray Line Emission from Accreting Black Holes
Ramesh Narayan, John Raymond
We present model X-ray spectra of accreting black holes with advection-dominated accretion flows, paying attention to thermal emission lines from the hot plasma. We show that the A…
A Population of Faint Non-Transient Low Mass Black Hole Binaries
Kristen Menou, Ramesh Narayan, Jean-Pierre Lasota
We study the thermal and viscous stability of accretion flows in Low Mass Black Hole Binaries (LMBHBs). We consider a model in which an inner advection-dominated accretion flow (AD…
Spectral Models of Advection-Dominated Accretion Flows with Winds
Eliot Quataert, Ramesh Narayan
We calculate spectral models of advection-dominated accretion flows, taking into account the possibility that significant mass may be lost to a wind. We apply the models to the sof…
On the Energetics of Advection-Dominated Accretion Flows
Eliot Quataert, Ramesh Narayan
Using mean field MHD, we discuss the energetics of optically thin, two temperature, advection-dominated accretion flows (ADAFs). If the magnetic field is tangled and roughly isotro…
Black Hole and Neutron Star Transients in Quiescence
Kristen Menou, Ann A. Esin, Ramesh Narayan +3
We consider the X-ray luminosity difference between neutron star and black hole soft X-ray transients (NS and BH SXTs) in quiescence. The current observational data suggest that BH…
What is the Accretion Rate in NGC 4258?
Charles F. Gammie, Ramesh Narayan, Roger Blandford
We consider the implications of recent infrared and radio observations of the nucleus of NGC 4258. There is no direct evidence that the nucleus has been steadily accreting on the v…