Constraints on the Spacetime Metric around Seven "Bare" AGNs Using X-Ray Reflection Spectroscopy

We present the study of a sample of seven "bare" active galactic nuclei observed with Suzaku. We interpret the spectrum of these sources with a relativistic reflection component and we employ our model relxill_nk to test the Kerr nature of their supermassive black holes. We constrain the J...

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Bibliographic Details
Published in:The Astrophysical journal 2019-04, Vol.874 (2), p.135
Main Authors: Tripathi, Ashutosh, Yan, Jinli, Yang, Yuchan, Yan, Yunfeng, Garnham, Marcus, Yao, Yu, Li, Songcheng, Ding, Ziyu, Abdikamalov, Askar B., Ayzenberg, Dimitry, Bambi, Cosimo, Dauser, Thomas, García, Javier A., Jiang, Jiachen, Nampalliwar, Sourabh
Format: Article
Language:English
Subjects:
accretion, accretion disks
Active galactic nuclei
Astrophysics
black hole physics
Black holes
gravitation
Model testing
Spacetime
Spectroscopy
Supermassive black holes
X ray reflection
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Summary:We present the study of a sample of seven "bare" active galactic nuclei observed with Suzaku. We interpret the spectrum of these sources with a relativistic reflection component and we employ our model relxill_nk to test the Kerr nature of their supermassive black holes. We constrain the Johannsen deformation parameters 13 and 22, in which the Kerr metric is recovered when 13 = 22 = 0. All our measurements are consistent with the hypothesis that the spacetime geometry around these supermassive objects is described by the Kerr solution. For some sources, we obtain quite strong constraints on 13 and 22 when compared to those found in our previous studies. We discuss the systematic uncertainties in our tests and the implications of our results.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab0a00