230 citations · 1.2k across the 11 of their papers we have counts for
11 papers
HEROIC: 3D General Relativistic Radiative Postprocessor with Comptonization for Black Hole Accretion Discs
Ramesh Narayan, Yucong Zhu, Dimitrios Psaltis +1
We describe HEROIC, an upgraded version of the relativistic radiative post-processor code HERO described in a previous paper, but which now Includes Comptonization. HEROIC models C…
HERO: A 3D General Relativistic Radiative Postprocessor for Accretion Discs around Black Holes
Yucong Zhu, Ramesh Narayan, Aleksander Sadowski +1
HERO (Hybrid Evaluator for Radiative Objects) is a 3D general relativistic radiative transfer code which has been tailored to the problem of analyzing radiation from simulations of…
Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo
Aleksander Sadowski, Ramesh Narayan, Alexander Tchekhovskoy +3
We present a sub-grid model that emulates the magnetic dynamo operating in magnetized accretion disks. We have implemented this model in the general relativisic radiation magnetohy…
A High-Frequency Doppler Feature in the Power Spectra of Simulated GRMHD Black Hole Accretion Disks
Sarah Wellons, Yucong Zhu, Dimitrios Psaltis +2
Black hole binaries exhibit a wide range of variability phenomena, from large-scale state changes to broadband noise and quasi-periodic oscillations, but the physical nature of muc…
Energy, momentum and mass outflows and feedback from thick accretion discs around rotating black holes
A. Sadowski, R. Narayan, R. Penna +1
Using long-duration general relativistic magnetohydrodynamic simulations of radiatively inefficient accretion discs, the energy, momentum and mass outflow rates from such systems a…
Thermal Stability in Turbulently Mixed Accretion Discs
Yucong Zhu, Ramesh Narayan
The standard thin accretion disc model predicts that discs around stellar mass black holes become radiation pressure dominated and thermally unstable once their luminosity exceeds…
Semi-implicit scheme for treating radiation under M1 closure in general relativistic conservative fluid dynamics codes
Aleksander Sadowski, Ramesh Narayan, Alexander Tchekhovskoy +1
A numerical scheme is described for including radiation in multi-dimensional general-relativistic conservative fluid dynamics codes. In this method, a covariant form of the M1 clos…
The Eye of the Storm: Light from the Inner Plunging Region of Black Hole Accretion Discs
Yucong Zhu, Shane W. Davis, Ramesh Narayan +3
It is generally thought that the light coming from the inner plunging region of black hole accretion discs contributes negligibly to the disc's overall spectrum, i.e. the plunging…
On the Correlations between Galaxy Properties and Supermassive Black Hole Mass
A. Beifiori, S. Courteau, E. M. Corsini +1
We use a large sample of upper limits and accurate estimates of supermassive black holes masses coupled with libraries of host galaxy velocity dispersions, rotational velocities an…
The Cool Accretion Disk in ESO 243-49 HLX-1: Further Evidence of an Intermediate Mass Black Hole
Shane W. Davis, Ramesh Narayan, Yucong Zhu +5
With an inferred bolometric luminosity exceeding 10^42 erg/s, HLX-1 in ESO 243-49 is the most luminous of ultraluminous X-ray sources and provides one of the strongest cases for th…
Measuring Black Hole Spin by the Continuum-Fitting Method: Effect of Deviations from the Novikov-Thorne Disc Model
Akshay K. Kulkarni, Robert F. Penna, Roman V. Shcherbakov +7
The X-ray spectra of accretion discs of eight stellar-mass black holes have been analyzed to date using the thermal continuum fitting method, and the spectral fits have been used t…