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

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 13 and 22, for which the Kerr solution is recovered when 13 = 22 = 0. We analyze a NuSTAR observat...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 875; no. 1; pp. 41 - 48
Main Authors Zhang, Yuexin, Abdikamalov, Askar B., Ayzenberg, Dimitry, Bambi, Cosimo, Dauser, Thomas, García, Javier A., Nampalliwar, Sourabh
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 10.04.2019
IOP Publishing
Subjects
Accretion
Accretion disks
accretion, accretion disks
Astronomical models
Astrophysics
black hole physics
Black holes
Deformation
gravitation
Model testing
Parameters
Spectroscopy
X ray reflection
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Summary: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 13 and 22, for which the Kerr solution is recovered when 13 = 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.
Bibliography:High-Energy Phenomena and Fundamental Physics
AAS15730
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab0e79