257 citations · 1.9k across the 30 of their papers we have counts for
11 papers · 2 filters
On The Nature of the Compact Dark Mass at the Galactic Center
Avery E. Broderick, Ramesh Narayan
We consider a model in which Sgr A*, the 3.5x10^6 M_sun supermassive black hole candidate at the Galactic Center, is a compact object with a surface. Given the very low quiescent l…
Thermal X-Ray Iron Line Emission from the Galactic Center Black Hole Sagittarius A*
Ya-Di Xu, Ramesh Narayan, Eliot Quataert +2
We model thermal X-ray emission from the accreting supermassive black hole Sagittarius A* at the Galactic Center. For the region inside of the center, we use a…
How Much Mass do Supermassive Black Holes Eat in their Old Age?
Philip F. Hopkins, Ramesh Narayan, Lars Hernquist
We consider the distribution of local supermassive black hole Eddington ratios and accretion rates, accounting for the dependence of radiative efficiency and bolometric corrections…
Fitting Formula for Flux Scintillation of Compact Radio Sources
J. Goodman, R. Narayan
We present a fitting function to describe the statistics of flux modulations caused by interstellar scintillation. The function models a very general quantity: the cross-correlatio…
The Rates of type I X-ray Bursts from Transients Observed with RXTE: Evidence for Black Hole Event Horizons
Ronald A. Remillard, Dacheng Lin, Randall L. Cooper +1
We measure the rates of type I X-ray bursts, as a function of the bolometric luminosity, from a likely complete sample of 37 non-pulsing transients (1996-2004). Our goals are to te…
Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum
Rebecca Shafee, Jeffrey E. McClintock, Ramesh Narayan +3
We fit X-ray spectral data in the thermal dominant or high soft state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin par…