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The Spin of the Near-Extreme Kerr Black Hole GRS 1915+105
- J. McClintock, R. Shafee, R. Narayan, R. Remillard, S. Davis, Li-Xin Li
- Physics
- 4 June 2006
Based on a spectral analysis of the X-ray continuum that employs a fully relativistic accretion disk model, we conclude that the compact primary of the binary X-ray source GRS 1915+105 is a rapidly…
SUSTAINED MAGNETOROTATIONAL TURBULENCE IN LOCAL SIMULATIONS OF STRATIFIED DISKS WITH ZERO NET MAGNETIC FLUX
We examine the effects of density stratification on magnetohydrodynamic turbulence driven by the magnetorotational instability in local simulations that adopt the shearing box approximation. Our…
Relativistic Accretion Disk Models of High-State Black Hole X-Ray Binary Spectra
We present calculations of non-LTE, relativistic accretion disk models applicable to the high/soft state of black hole X-ray binaries. We include the effects of thermal Comptonization and bound-free…
Intrinsic disc emission and the soft X‐ray excess in active galactic nuclei
Narrow-line Seyfert 1 (NLS1) galaxies have low-mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the extreme…
THE RADIATIVE EFFICIENCY OF ACCRETION FLOWS IN INDIVIDUAL ACTIVE GALACTIC NUCLEI
The radiative efficiency of active galactic nucleus (AGN) is commonly estimated based on the total mass accreted and the total AGN light emitted per unit volume in the universe integrated over time…
Estimating the Spin of Stellar-Mass Black Holes by Spectral Fitting of the X-Ray Continuum
- R. Shafee, J. McClintock, R. Narayan, S. Davis, Li-Xin Li, R. Remillard
- Physics
- 14 August 2005
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 parameters a* ≡ a/M…
A GLOBAL THREE-DIMENSIONAL RADIATION MAGNETO-HYDRODYNAMIC SIMULATION OF SUPER-EDDINGTON ACCRETION DISKS
- Y. Jiang 姜, J. Stone, S. Davis
- Physics
- 2 October 2014
We study super-Eddington accretion flows onto black holes using a global three-dimensional radiation magneto-hydrodynamical simulation. We solve the time-dependent radiative transfer equation for the…
THE EXTREME SPIN OF THE BLACK HOLE IN CYGNUS X-1
- L. Gou, J. McClintock, S. Davis
- Physics
- 1 May 2011
The compact primary in the X-ray binary Cygnus X-1 was the first black hole to be established via dynamical observations. We have recently determined accurate values for its mass and distance, and…
The UV Continuum of Quasars: Models and SDSS Spectral Slopes
We measure long (2200-4000 Å) and short (1450-2200 Å) wavelength spectral slopes α (Fν ∝ να) for quasar spectra from the Sloan Digital Sky Survey. The long- and short-wavelength slopes are computed…
Black hole spin in GRS 1915+105
- M. Middleton, C. Done, M. Gierliński, S. Davis
- Physics
- 24 January 2006
Microquasars are galactic black hole binary systems with radio jets which can sometimes be spatially resolved to show superluminal motion. The first and best known of this class of objects is GRS…
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