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Evidence for the Black Hole Event Horizon
Ramesh Narayan
Astronomers have discovered many candidate black holes in X-ray binaries and in the nuclei of galaxies. The candidate objects are too massive to be neutron stars, and for this reas…
Quasi-Periodic Oscillations from Rayleigh-Taylor and Kelvin-Helmholtz Instability at a Disk-Magnetosphere Interface
Li-Xin Li, Ramesh Narayan
We consider the interface between an accretion disk and a magnetosphere surrounding the accreting mass. We argue that such an interface can occur not only with a magnetized neutron…
Turbulent Mixing in Clusters of Galaxies
Woong-Tae Kim, Ramesh Narayan
We present a spherically-symmetric, steady-state model of galaxy clusters in which radiative cooling from the hot gas is balanced by heat transport through turbulent mixing. We ass…
Bondi Accretion and the Problem of the Missing Isolated Neutron Stars
Rosalba Perna, Ramesh Narayan, George Rybicki +2
A large number of neutron stars (NSs), ~10^9, populate the Galaxy, but only a tiny fraction of them is observable during the short radio pulsar lifetime. The majority of these isol…
Self-Similar Hot Accretion onto a Spinning Neutron Star: Matching the Outer Boundary Conditions
Ramesh Narayan, Mikhail V. Medvedev
Medvedev & Narayan have described a hot accretion flow onto a spinning neutron star in which the gas viscously brakes the spin of the star. Their self-similar solution has the surp…
Multiwavelength Spectrum of the Black Hole XTE J1118+480 in Quiescence
Jeffrey E. McClintock, Ramesh Narayan, Michael R. Garcia +3
We present an X-ray/UV/optical spectrum of the black hole primary in the X-ray nova XTE J1118+480 in quiescence at L_x = 4 x 10^{-9} of the Eddington luminosity. The Chandra, HST a…