About the Kerr Nature of the Stellar-mass Black Hole in GRS 1915+105
Abstract
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.
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.Attached Files
Published - Zhang_2019_ApJ_875_41.pdf
Submitted - 1901.06117.pdf
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Additional details
- Eprint ID
- 94781
- Resolver ID
- CaltechAUTHORS:20190418-092902776
- U1531117
- National Natural Science Foundation of China
- IDH1512060
- Fudan University
- Shanghai Government
- Alexander von Humboldt Foundation
- Eberhard-Karls Universität Tübingen
- Created
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2019-04-18Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field