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

被引：44

作者：

Tripathi, Ashutosh ^{[1
,2
]}

Yan, Jinli ^{[1
,2
]}

Yang, Yuchan ^{[1
,2
]}

Yan, Yunfeng ^{[1
,2
]}

Garnham, Marcus ^{[1
,2
,3
]}

Yao, Yu ^{[1
,2
]}

Li, Songcheng ^{[1
,2
]}

Ding, Ziyu ^{[1
,2
]}

Abdikamalov, Askar B. ^{[1
,2
]}

Ayzenberg, Dimitry ^{[1
,2
]}

Bambi, Cosimo ^{[1
,2
]}

Dauser, Thomas ^{[4
,5
]}

Garcia, Javier A. ^{[4
,5
,6
]}

Jiang, Jiachen ^{[7
]}

Nampalliwar, Sourabh ^{[8
]}

机构：

[1] Fudan Univ, Ctr Field Theory & Particle Phys, Shanghai 200438, Peoples R China

[2] Fudan Univ, Dept Phys, Shanghai 200438, Peoples R China

[3] Univ Nottingham, Dept Phys & Astron, Univ Pk, Nottingham NG7 2RD, England

[4] Univ Erlangen Nurnberg, Remeis Observ, D-96049 Bamberg, Germany

[5] Univ Erlangen Nurnberg, ECAP, D-96049 Bamberg, Germany

[6] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[7] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[8] Eberhard Karls Univ Tubingen, Theoret Astrophys, D-72076 Tubingen, Germany

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 874卷 / 02期

基金：

中国国家自然科学基金;

关键词：

accretion; accretion disks; black hole physics; gravitation; BLACK-HOLE; ABSORPTION; SPECTRA;

D O I：

10.3847/1538-4357/ab0a00

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 alpha(13) and alpha(22), in which the Kerr metric is recovered when alpha(13) = alpha(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 alpha(13) and alpha(22) when compared to those found in our previous studies. We discuss the systematic uncertainties in our tests and the implications of our results.

引用

页数：14

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