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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…
The Giant X-Ray Flare of NGC 5905: Tidal Disruption of a Star, a Brown Dwarf, or a Planet?
Li-Xin Li, Ramesh Narayan, Kristen Menou
We model the 1990 giant X-ray flare of the quiescent galaxy NGC 5905 as the tidal disruption of a star by a supermassive black hole. From the observed rapid decline of the luminosi…