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12 September 2019

9 Pages

RELXILL_NK: A Black Hole Relativistic Reflection Model for Testing General Relativity †

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,
and
1
Center for Field Theory and Particle Physics and Department of Physics, Fudan University, Shanghai 200438, China
2
Theoretical Astrophysics, Eberhard-Karls Universität Tübingen, 72076 Tübingen, Germany
*
Author to whom correspondence should be addressed.
†
Presented at the meeting Recent Progress in Relativistic Astrophysics, Shanghai, China, 6–8 May 2019.
Proceedings2019, 17(1), 7;https://doi.org/10.3390/proceedings2019017007
This article belongs to the Proceedings of Recent Progress in Relativistic Astrophysics
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Abstract

In this paper, we briefly present RELXILL_NK, the first and currently only readily available model of the relativistic reflection spectrum of black hole accretion disks that includes non-Kerr solutions for the black hole spacetime, thus allowing for tests of the Kerr hypothesis and general relativity (GR). RELXILL_NK makes use of a general relativistic ray-tracing code to calculate the relativistic effects of any well-behaved, stationary, axisymmetric, and asymptotically flat black hole spacetime, while the disk physics is handled through the non-relativistic X-ray reflection code XILLVER. A number of different flavors are available within RELXILL_NK; we summarize and compare these flavors using the Johannsen metric for the black hole spacetime.

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