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Non-Axisymmetric g-Mode and p-Mode Instability in a Hydrodynamic Thin Accretion Disk
Li-Xin Li, Jeremy Goodman, Ramesh Narayan
It has been suggested that quasi-periodic oscillations of accreting X-ray sources may relate to the modes named in the title. We consider non-axisymmetric linear perturbations to a…
On the Minimum Energy Configuration of a Rotating Barotropic Fluid
Ramesh Narayan, James E. Pringle
In a recent paper (astro-ph/0207561, posted on July 25, 2002), Fromang & Balbus state that ``a uniformly rotating barotropic fluid in an external potential attains a true energy mi…
Neutrino trapping and accretion models for Gamma-Ray Bursts
Tiziana Di Matteo, Rosalba Perna, Ramesh Narayan
Many models of Gamma Ray Bursts invoke a central engine consisting of a black hole of a few solar masses accreting matter from a disk at a rate of a fraction to a few solar masses…
Models of Galaxy Clusters with Thermal Conduction
Nadia L. Zakamska, Ramesh Narayan
We present a simple model of hot gas in galaxy clusters, assuming hydrostatic equilibrium and energy balance between radiative cooling and thermal conduction. For five clusters, A1…
X-ray Lines From Gamma-ray Bursts
Pawan Kumar, Ramesh Narayan
X-ray lines have been recently detected in the afterglows of a few gamma-ray bursts. We derive constraints on the physical conditions in the line-emitting gas, using as an example…
Evidence for the Black Hole Event Horizon
Ramesh Narayan, Jeremy S. Heyl
Roughly a dozen X-ray binaries are presently known in which the compact accreting primary stars are too massive to be neutron stars. These primaries are identified as black holes,…