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Thermal Conduction in Clusters of Galaxies
Ramesh Narayan, Mikhail V. Medvedev
We estimate the thermal conductivity of a weakly collisional magnetized plasma with chaotic magnetic field fluctuations. When the fluctuation spectrum extends over two or more deca…
On the Radial Structure of Radiatively Inefficient Accretion Flows with Convection
Marek A. Abramowicz, Igor V. Igumenshchev, Eliot Quataert +1
We consider the radial structure of radiatively inefficient hydrodynamic accretion flows around black holes. We show that low-viscosity flows consist of two zones: an outer convect…
Thermal Conduction and the Stability of Hot Accretion Flows
Mikhail V. Medvedev, Ramesh Narayan
Recently, Medvedev & Narayan (2001) discovered a new type of accretion flow, a hot settling flow around a rapidly rotating neutron star. The flow is cooling-dominated and energetic…
X-ray Novae and the Evidence for Black Hole Event Horizons
Ramesh Narayan, Michael R. Garcia, Jeffrey E. McClintock
We discuss new observations of X-ray novae which provide strong evidence that black holes have event horizons. Optical observations of 13 X-ray novae indicate that these binary sta…
Self-Similar Hot Accretion Flow onto a Rotating Neutron Star: Structure and Stability
Mikhail Medvedev, Ramesh Narayan
We present analytical and numerical solutions which describe a hot, viscous, two-temperature accretion flow onto a rotating neutron star or any other rotating compact star with a s…
Accretion Models of Gamma-Ray Bursts
Ramesh Narayan, Tsvi Piran, Pawan Kumar
Many models of gamma-ray bursts (GRBs) involve accretion onto a compact object, usually a black hole, at a mass accretion rate of order a fraction of a solar mass per second. If th…