Article

Constraining the Johannsen deformation parameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>ε</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> with black hole x-ray data

Ashutosh TripathiCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaAskar B. AbdikamalovCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaDimitry AyzenbergCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaCosimo BambiCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaSourabh NampalliwarTheoretical Astrophysics, Eberhard-Karls Universität Tübingen, 72076 Tübingen, Germany

2019lv

ABI

Abstract

We extend our previous work on tests of the Kerr black hole hypothesis using x-ray reflection spectroscopy and we infer observational constraints on the Johannsen deformation parameter ${\ensuremath{\epsilon}}_{3}$. We analyze a NuSTAR observation of the stellar-mass black hole in GS 1354--645, Suzaku data of the supermassive black holes in Ark 564, 1H0419--577, and PKS 0558--504, and some simultaneous XMM-Newton and NuSTAR observations of the supermassive black hole in MCG--6--30--15. All our measurements of ${\ensuremath{\epsilon}}_{3}$ are consistent with the Kerr metric and we find quite strong constraints from Ark 564 and MCG--6--30--15. We discuss the implications of our results and the next steps to improve our tests.

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Identifiers

DOI: 10.1103/physrevd.99.083001

Citations and references

Cited by 30 references

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