CaltechAUTHORS
Published April 1, 2019 | Version Submitted + Published
Journal Article Open

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

Creators

  • 1. ROR icon Fudan University
  • 2. ROR icon University of Nottingham
  • 3. ROR icon University of Erlangen-Nuremberg
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon University of Cambridge
  • 6. ROR icon University of Tübingen

Abstract

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

Additional Information

© 2019. The American Astronomical Society. Received 2019 January 12; revised 2019 February 15; accepted 2019 February 23; published 2019 April 1. This work was supported by the National Natural Science Foundation of China (NSFC), grant No. U1531117, and Fudan University, grant No. IDH1512060. A.T. also acknowledges support from the China Scholarship Council (CSC), grant No. 2016GXZR89. A.B.A. also acknowledges the support from the Shanghai Government Scholarship (SGS). J.A.G. acknowledges support from the Alexander von Humboldt Foundation. J.J. is supported by the Cambridge Trust and the Chinese Scholarship Council Joint Scholarship Programme (201604100032). S.N. acknowledges support from the Excellence Initiative at Eberhard-Karls Universität Tübingen.

Attached Files

Published - Tripathi_2019_ApJ_874_135.pdf

Submitted - 1901.03064.pdf

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1901.03064.pdf

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Additional details

Identifiers

Eprint ID
94308
Resolver ID
CaltechAUTHORS:20190401-084307071

Related works

Describes
https://arxiv.org/abs/1901.03064 (URL)

Funding

National Natural Science Foundation of China
U1531117
Fudan University
IDH1512060
China Scholarship Council
2016GXZR89
Shanghai Government Scholarship
Alexander von Humboldt Foundation
China Scholarship Council
201604100032
Cambridge Trust
Eberhard-Karls Universität Tübingen

Dates

Created
2019-04-01
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field

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Caltech groups
Space Radiation Laboratory