Journal
ASTROPHYSICAL JOURNAL
Volume 875, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab0e7e
Keywords
accretion, accretion disks; black hole physics; gravitation
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Funding
- National Natural Science Foundation of China (NSFC) [U1531117]
- Fudan University [IDH1512060]
- China Scholarship Council (CSC) [2016GXZR89]
- Excellence Initiative at Eberhard-Karls Universitat Tubingen
- Shanghai Government Scholarship (SGS)
- Alexander von Humboldt Foundation
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Astrophysical black hole systems are the ideal laboratories for testing Einstein's theory of gravity in the strong field regime. We have recently developed a framework that uses the reflection spectrum of black hole systems to perform precision tests of general relativity by testing the Kerr black hole hypothesis. In this paper, we analyze XMM-Newton and NuSTAR observations of the supermassive black hole in the Seyfert 1 galaxy MCG-06-30-15 with our disk reflection model. We consider the Johannsen metric with the deformation parameters alpha(13) and alpha(22), which quantify deviations from the Kerr metric. For alpha(22) = 0, we obtain the black hole spin 0.928 < a* < 0.983 and -0.44 < alpha(13) < 0.15. For alpha(13) = 0, we obtain 0.885 < a* < 0.987 and -0.12 < alpha(22) < 1.05. The Kerr solution is recovered for alpha(13) = alpha(22) = 0. Thus, our results include the Kerr solution within statistical uncertainties. Systematic uncertainties are difficult to account for, and we discuss some issues in this regard.
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