期刊
ASTROPHYSICAL JOURNAL
卷 865, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aadb9d
关键词
accretion, accretion disks; black hole physics; gravitation
资金
- National Natural Science Foundation of China (NSFC) [U1531117]
- Fudan University [IDH1512060]
- Excellence Initiative at Eberhard-Karls Universitat Tubingen
- Shanghai Government Scholarship (SGS)
- Alexander von Humboldt Foundation
- Cambridge Trust [201604100032]
- Chinese Scholarship Council [201604100032]
It is thought that the spacetime metric around astrophysical black holes is well described by the Kerr solution of Einstein's gravity. However, robust observational evidence of the Kerr nature of these objects is still lacking. Here we fit the X-ray spectrum of the stellar-mass black hole in GS 1354-645 with a disk reflection model beyond Einstein's gravity in order test the Kerr black hole hypothesis. We consider the Johannsen metric with the deformation parameters alpha(13) and alpha(22). The Kerr metric is recovered for alpha(13 )= alpha(22) = 0. For alpha(22) = 0, our measurements of the black hole spin and of the deformation parameter alpha(13) are alpha(*) > 0.975 and -0.34 < alpha(13 )< 0.16, respectively. For alpha(13 )= 0, we find alpha* > 0.975 and -0.09 < alpha(22) < 0.42. All the reported uncertainties are at 99% of confidence level for two relevant parameters.
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