期刊
ASTROPHYSICAL JOURNAL
卷 878, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab089e
关键词
accretion, accretion disks; black hole physics; hydrodynamics; magnetohydrodynamics (MHD); relativistic processes
资金
- National Science Foundation [NSF PHY-1748958, NSF AST 13-33612, NSF AST 1715054]
- Chandra theory grant from the Smithsonian Institution [TM7-18006X]
- Simons Investigator award from the Simons Foundation
We conduct a systematic study of the properties of tilted accretion flows around spinning black holes, covering a range of tilt angles and black hole spins, using the general-relativistic magnetohydrodynamics code ATHENA++. The same initial magnetized torus is evolved around black holes with spins ranging from 0 to 0.9, with inclinations ranging from 0 degrees to 24 degrees . The tilted disks quickly reach a warped and twisted shape that rigidly precesses about the black hole spin axis with deformations in shape large enough to hinder the application of linear bending wave theory. Magnetized polar outflows form, oriented along the disk rotation axes. At sufficiently high inclinations a pair of standing shocks develops in the disks. These shocks dramatically affect the flow at small radii, driving angular momentum transport. At high spins they redirect material more effectively than they heat it, reducing the dissipation rate relative to the mass accretion rate and lowering the heating efficiency of the flow.
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