Journal
ADVANCES IN SPACE RESEARCH
Volume 47, Issue 3, Pages 528-532Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2010.10.019
Keywords
Accretion; accretion disks; Black hole physics; Gravitation; Galaxy: center; Gravitational lensing: strong; Line: profiles
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Funding
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [746549] Funding Source: National Science Foundation
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According to the no-hair theorem, astrophysical black holes are uniquely described by their mass and spin. In this paper, we review a new framework for testing the no-hair hypothesis with observations in the electromagnetic spectrum. The approach is formulated in terms of a Kerr-like spacetime containing a quadrupole moment that is independent of both mass and spin. If the no-hair theorem is correct, then any deviation from the Kerr metric quadrupole has to be zero. We show how upcoming VLBI imaging observations of Sgr A* as well as spectroscopic observations of iron lines from accreting black holes with IXO may lead to the first astrophysical test of the no-hair theorem. (C) 2010 COSPAR. Published by Elsevier Ltd. All rights reserved.
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