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 ${\alpha }_{13}$ and ${\alpha }_{22}$, for which the Kerr solution is recovered when ${\alpha }_{13}={\alpha }_{22}=0$. 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.

10 pages, 6 figures. v2: refereed version

References in corpus (7)

• The Confrontation between General Relativity and Experiment
• Testing the black hole "no-hair" hypothesis
• Testing the space-time geometry around black hole candidates with the analysis of the broad K$\alpha$ iron line
• Profiles of emission lines generated by rings orbiting braneworld Kerr black holes
• Iron K$\alpha$ line of Kerr black holes with scalar hair
• Broad K$\alpha$ iron line from accretion disks around traversable wormholes
• Constraints on the spacetime metric around seven "bare" AGNs using X-ray reflection spectroscopy

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