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Astrophysical Evidence for Black Hole Event Horizons
K. Menou, E. Quataert, R. Narayan
Astronomers have discovered many potential black holes in X-ray binaries and galactic nuclei. These black holes are usually identified by the fact that they are too massive to be n…
Spectra and Light Curves of Gamma-Ray Burst Afterglows
Re'em Sari, Tsvi Piran, Ramesh Narayan
The recently discovered GRB afterglow is believed to be described reasonably well by synchrotron emission from a slowing down relativistic shell that collides with an external medi…
Spectral Transitions in Cyg X-1 and Other Black Hole X-Ray Binaries
Ann A. Esin, Ramesh Narayan, Wei Cui +2
We show that the model proposed by Esin, McClintock & Narayan (1997) for the low state, intermediate state and high state of the black hole soft X-ray transient, Nova Muscae 1991,…
The Hardness Distribution of Gamma-Ray Bursts
Ehud Cohen, Tsvi Piran, Ramesh Narayan
It is often stated that gamma-ray bursts (GRBs) have typical energies of several hundreds $\keV$, where the typical energy may be characterized by the hardness H, the photon energy…
Two-phase spectral modelling of 1E1740.7-2942
O. Vilhu, J. Nevalainen, J. Poutanen +5
Combined ASCA and SIGMA data of 1E1740.7-2942 during the standard state (September 1993 and 1994) were fitted with two-phase models (ISMBB/Poutanen at al. and ADAF/Narayan et al.).…
Advection-Dominated Accretion and the Spectral States of Black Hole X-Ray Binaries: Application to Nova Muscae 1991
A. A. Esin, J. E. McClintock, R. Narayan
We present a self-consistent model of accretion flows which unifies four distinct spectral states observed in black hole X-ray binaries: quiescent, low, intermediate and high state…