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A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant
Norman A. Grogin, Ramesh Narayan
We present a simple mass model for the lensing galaxy in the gravitationally lensed quasar 0957+561. The model is a generalization of the singular isothermal sphere and includes a…
Are There MeV Gamma-Ray Bursts?
Tsvi Piran, Ramesh Narayan
It is often stated that gamma-ray bursts (GRBs) have typical energies of several hundred keV. Is this a real feature of GRBs or is it due to an observational bias? We consider the…
Advection-Dominated Accretion Flows: Optically Thin Solutions
Ramesh Narayan
General properties of advection-dominated accretion flows are discussed. Special emphasis is given to the optically thin branch of solutions, which has very high ion and electron t…
Advection-Dominated Models of Luminous Accreting Black Holes
Ramesh Narayan
It has been found that a class of optically-thin two-temperature advection-dominated accretion solutions explains many observations of low-luminosity accreting black holes. Here it…
Advection-Dominated Accretion Model of Sagittarius A and Other Accreting Black Holes
Ramesh Narayan, Insu Yi, Rohan Mahadevan
Viscous rotating accretion flows around black holes become advection-dominated when the accretion rate is sufficiently low. Most of the accretion energy in such flows is s…
Models of Quiescent Black Hole Neutron Star Soft X-Ray Transients
Insu Yi, Ramesh Narayan, Didier Barret +1
When the mass accretion rate onto a black hole (BH) falls below a critical rate, , accretion can occur via a hot optically thin flow where m…