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Title: Physical properties of the inner shocks in hot, tilted black hole accretion flows

Simulations of hot, pressure-supported, tilted black hole accretion flows, in which the angular momentum of the flow is misaligned with the black hole spin axis, can exhibit two nonaxisymmetric shock structures in the inner regions of the flow. We analyze the strength and significance of these shock structures in simulations with tilt angles of 10° and 15°. By integrating fluid trajectories in the simulations through the shocks and tracking the variations of fluid quantities along these trajectories, we show that these shocks are strong, with substantial compression ratios, in contrast to earlier claims. However, they are only moderately relativistic. We also show that the two density enhancements resembling flow streams in their shape are in fact merely post-shock compressions, as fluid trajectories cut across, rather than flow along, them. The dissipation associated with the shocks is a substantial fraction (≅ 3%-12%) of the rest mass energy advected into the hole, and therefore comparable to the dissipation expected from turbulence. The shocks should therefore make order unity changes in the observed properties of black hole accretion flows that are tilted.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027 (United States)
  2. Department of Physics, University of California, Santa Barbara, Santa Barbara CA 93106 (United States)
  3. Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States)
  4. Natural Science Division, Pepperdine University, Malibu, CA 90263 (United States)
Publication Date:
OSTI Identifier:
22348296
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BLACK HOLES; COMPARATIVE EVALUATIONS; COMPRESSION; COMPUTERIZED SIMULATION; DENSITY; MAGNETOHYDRODYNAMICS; RELATIVISTIC RANGE; SHOCK WAVES; SPIN; STREAMS; TRAJECTORIES; TURBULENCE