2.3k citations · 53.2k across the 308 of their papers we have counts for
11 papers · 2 filters
Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
Abraham Loeb, Ramesh Narayan
We place constraints on the dynamics of the Local Group (LG) by comparing the dipole of the Cosmic Microwave Background (CMB) with the peculiar velocity induced by the 2MRS galaxy…
Estimating the Spins of Stellar-Mass Black Holes by Fitting Their Continuum Spectra
Ramesh Narayan, Jeffrey E. McClintock, Rebecca Shafee
We have used the Novikov-Thorne thin disk model to fit the continuum X-ray spectra of three transient black hole X-ray binaries in the thermal state. From the fits we estimate the…
Supplementary Information for "A 15.65 solar mass black hole in an eclipsing binary in the nearby spiral galaxy Messier 33"
Jerome A. Orosz, Jeffrey E. McClintock, Ramesh Narayan +8
This Supplementary Information provides details about the spectral extraction (crowding issues and the removal of nebular lines), a discussion about the distance to M33, a model fo…
A 15.65 solar mass black hole in an eclipsing binary in the nearby spiral galaxy Messier 33
Jerome A. Orosz, Jeffrey E. McClintock, Ramesh Narayan +8
Stellar-mass black holes are discovered in X-ray emitting binary systems, where their mass can be determined from the dynamics of their companion stars. Models of stellar evolution…
Oscillating Starless Cores: The Nonlinear Regime
Avery E. Broderick, Eric Keto, Charles J. Lada +1
In a previous paper, we modeled the oscillations of a thermally-supported (Bonnor-Ebert) sphere as non-radial, linear perturbations following a standard analysis developed for stel…
Estimating the Spins of Stellar-Mass Black Holes
Jeffrey E. McClintock, Ramesh Narayan, Rebecca Shafee
We describe a program that we have embarked on to estimate the spins of stellar-mass black holes in X-ray binaries. We fit the continuum X-ray spectrum of the radiation from the ac…
Viscous Torque and Dissipation in the Inner Region of a Thin Accretion Disk: Implications for Measuring Black Hole Spin
Rebecca Shafee, Ramesh Narayan, Jeffrey E. McClintock
We consider a simple Newtonian model of a steady accretion disk around a black hole. The model is based on height-integrated hydrodynamic equations, alpha-viscosity, and a pseudo-N…
WHAM: A WENO-based general relativistic numerical scheme I: Hydrodynamics
Alexander Tchekhovskoy, Jonathan C. McKinney, Ramesh Narayan
Active galactic nuclei, x-ray binaries, pulsars, and gamma-ray bursts are all believed to be powered by compact objects surrounded by relativistic plasma flows driving phenomena su…
High Energy Afterglow from Gamma-ray Bursts
Yi-Zhong Fan, Tsvi Piran, Ramesh Narayan +1
We calculate the very high energy (sub-GeV to TeV) inverse Compton emission of GRB afterglows. We argue that this emission provides a powerful test of the currently accepted afterg…
Multi-dimensional Treatment of Photon Emission from Accretion Disks around Black Holes
Kazunori Kohri, Ken Ohsuga, Ramesh Narayan
We consider photon emission from a supercritical accretion disk in which photons in the inner regions are trapped and advected in towards the center. Such disks are believed to be…
Hydrogen-Triggered Type I X-ray Bursts in a Two-Zone Model
Randall L. Cooper, Ramesh Narayan
We use the two-zone model of Cooper & Narayan to study the onset and time evolution of hydrogen-triggered type I X-ray bursts on accreting neutron stars. At the lowest accretion ra…