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Title:
Effective Inner Radius of Tilted Black Hole Accretion Disks
Authors:
Fragile, P. Chris
Publication:
The Astrophysical Journal Letters, Volume 706, Issue 2, pp. L246-L250 (2009). (ApJL Homepage)
Publication Date:
12/2009
Origin:
IOP
ApJ Keywords:
accretion, accretion disks, black hole physics, galaxies: active, X-rays: stars
DOI:
10.1088/0004-637X/706/2/L246
Bibliographic Code:
2009ApJ...706L.246F

Abstract

One of the primary means of determining the spin a of an astrophysical black hole is by actually measuring the inner radius r in of a surrounding accretion disk and using that to infer a. By comparing a number of different estimates of r in from simulations of tilted accretion disks with differing black hole spins, we show that such a procedure can give quite wrong answers. Over the range 0 <= a/M <= 0.9, we find that, for moderately thick disks (H/r ~ 0.2) with modest tilt (15°), r in is nearly independent of spin. This result is likely dependent on tilt, such that for larger tilts, it may even be that r in would increase with increasing spin. In the opposite limit, we confirm through numerical simulations of untilted disks that, in the limit of zero tilt, r in recovers approximately the expected dependence on a.
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