Testing the no-hair theorem with observations of black holes in the electromagnetic spectrum |
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Authors: | Tim Johannsen Dimitrios Psaltis |
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Institution: | 1. Physics Department, University of Arizona, 1118 E. 4th Street, Tucson, AZ 85721, USA;2. Astronomy Department, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721, USA |
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Abstract: | 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. |
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Keywords: | Accretion accretion disks Black hole physics Gravitation Galaxy: center Gravitational lensing: strong Line: profiles |
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