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Testing the Kerr hypothesis using x-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state

Liu, Honghui and Abdikamalov, Askar B. and Ayzenberg, Dimitry and Bambi, Cosimo and Dauser, Thomas and García, Javier A. and Nampalliwar, Sourabh (2019) Testing the Kerr hypothesis using x-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state. Physical Review D, 99 (12). Art. No. 123007. ISSN 2470-0010. doi:10.1103/PhysRevD.99.123007.

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We continue exploring the constraining capabilities of x-ray reflection spectroscopy to test the Kerr-nature of astrophysical black holes, and we present the results of our analysis of two NuSTAR observations of Cygnus X-1 in the soft state. We find that the final measurement can strongly depend on the assumption of the intensity profile. We conclude that Cygnus X-1 is not suitable for tests of general relativity using x-ray reflection spectroscopy, and we discuss the desired properties of a source to be a good candidate for our studies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bambi, Cosimo0000-0002-3180-9502
Dauser, Thomas0000-0003-4583-9048
García, Javier A.0000-0003-3828-2448
Additional Information:© 2019 American Physical Society. Received 19 April 2019; published 11 June 2019. We thank Dominic Walton for providing us his xstar table. This work was supported by the Innovation Program of the Shanghai Municipal Education Commission, Grant No. 2019-01-07-00-07-E00035, and Fudan University, Grant No. IDH1512060. A. B. A. also acknowledges the support from the Shanghai Government Scholarship (SGS). J. A. G. and S. N. acknowledge support from the Alexander von Humboldt Foundation. S. N. also acknowledges support from the Excellence Initiative at Eberhard-Karls Universität Tübingen.
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Shanghai Municipal Education Commission2019-01-07-00-07-E00035
Fudan UniversityIDH1512060
Shanghai Government ScholarshipUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Eberhard-Karls Universität TübingenUNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20190611-092516240
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96270
Deposited By: Tony Diaz
Deposited On:11 Jun 2019 16:42
Last Modified:16 Nov 2021 17:19

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