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MHD Simulation of a Disk Subjected to Lense-Thirring Precession
Kareem A. Sorathia, Julian H. Krolik, John F. Hawley
When matter orbits around a central mass obliquely with respect to the mass's spin axis, the Lense-Thirring effect causes it to precess at a rate declining sharply with radius. Eve…
Alignment of supermassive black hole binary orbits and spins
M. Coleman Miller, Julian H. Krolik
Recent studies of accretion onto supermassive black hole binaries suggest that much, perhaps most, of the matter eventually accretes onto one hole or the other. If so, then for bin…
Testing Convergence for Global Accretion Disks
John F. Hawley, Sherwood A. Richers, Xiaoyue Guan +1
Global disk simulations provide a powerful tool for investigating accretion and the underlying magnetohydrodynamic turbulence driven by the magneto-rotational instability (MRI). Us…
White Paper for Blazar Observations with a GEMS-like X-ray Polarimetry Mission
Henric Krawczynski, Lorella Angelini, Matthew Baring +27
In this document, we describe the scientific potential of blazar observations with a X-ray polarimetry mission like GEMS (Gravity and Extreme Magnetism SMEX). We describe five blaz…
Relaxation of Warped Disks: the Case of Pure Hydrodynamics
Kareem A. Sorathia, Julian H. Krolik, John F. Hawley
Orbiting disks may exhibit bends due to a misalignment between the angular momentum of the inner and outer regions of the disk. We begin a systematic simulational inquiry into the…
A Monte Carlo Code for Relativistic Radiation Transport Around Kerr Black Holes
Jeremy D. Schnittman, Julian H. Krolik
We present a new code for radiation transport around Kerr black holes, including arbitrary emission and absorption terms, as well as electron scattering and polarization. The code…
White Paper on GEMS Study of Polarized X-rays from Neutron Stars
Pranab Ghosh, Lorella Angelini, Matthew Baring +27
We examine the expected X-ray polarization properties of neutron-star X-ray sources of various types, e.g., accretion and rotation powered pulsars, magnetars, and low-mass X-ray bi…
X-ray Polarization from Black Holes: GEMS Scientific White Paper
Jeremy Schnittman, Lorella Angelini, Matthew Baring +27
We present here a summary of the scientific goals behind the Gravity and Extreme Magnetism SMEX (GEMS) X-ray polarimetry mission's black hole (BH) observing program. The primary ta…