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About the Kerr Nature of the Stellar-mass Black Hole in GRS 1915+105

Zhang, Yuexin and Abdikamalov, Askar B. and Ayzenberg, Dimitry and Bambi, Cosimo and Dauser, Thomas and García, Javier A. and Nampalliwar, Sourabh (2019) About the Kerr Nature of the Stellar-mass Black Hole in GRS 1915+105. Astrophysical Journal, 875 (1). Art. No. 41. ISSN 1538-4357. doi:10.3847/1538-4357/ab0e79.

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We employ the accretion disk reflection model RELXILL_NK to test the spacetime geometry around the stellar-mass black hole in GRS 1915+105. We adopt the Johannsen metric with the deformation parameters α_(13) and α_(22), for which the Kerr solution is recovered when α_(13) = α_(22) = 0. We analyze a NuSTAR observation of 2012, obtaining vanishing and non-vanishing values of the deformation parameters depending on the astrophysical model adopted. Similar difficulties were not found in our previous tests with other sources. The results of this work can shed light on the choice of sources suitable for testing the Kerr metric using X-ray reflection spectroscopy and on the parts of our reflection models that more urgently require improvement.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bambi, Cosimo0000-0002-3180-9502
Dauser, Thomas0000-0003-4583-9048
García, Javier A.0000-0003-3828-2448
Additional Information:© 2019 The American Astronomical Society. Received 2019 January 23; revised 2019 March 4; accepted 2019 March 8; published 2019 April 12. This work was supported by the National Natural Science Foundation of China (NSFC), grant No. U1531117, and Fudan University, grant No. IDH1512060. Y.Z. also acknowledges the support from the Fudan Undergraduate Research Opportunities Program (FDUROP). A.B.A. also acknowledges the support from the Shanghai Government Scholarship (SGS). J.A.G. acknowledges support from the Alexander von Humboldt Foundation. S.N. acknowledges support from the Excellence Initiative at Eberhard-Karls Universität Tübingen.
Funding AgencyGrant Number
National Natural Science Foundation of ChinaU1531117
Fudan UniversityIDH1512060
Shanghai GovernmentUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Eberhard-Karls Universität TübingenUNSPECIFIED
Subject Keywords:accretion, accretion disks – black hole physics – gravitation
Issue or Number:1
Record Number:CaltechAUTHORS:20190418-092902776
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Official Citation:Yuexin Zhang et al 2019 ApJ 875 41
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94781
Deposited By: Tony Diaz
Deposited On:18 Apr 2019 18:36
Last Modified:16 Nov 2021 17:07

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