A Study of the Strong Gravity Region of the Black Hole in GS 1354–645

Xu, Yerong; Nampalliwar, Sourabh; Abdikamalov, Askar B.; Ayzenberg, Dimitry; Bambi, Cosimo; Dauser, Robert C.; García, Javier A.; Jiang, Jiachen

doi:10.3847/1538-4357/aadb9d

Cited by 52 publications

(35 citation statements)

References 45 publications

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“…As of now, all studies reported in the literature are consistent with the hypothesis that the spacetime metric around astrophysical BHs is described by the Kerr solution and present constraints on the value of certain deformation parameters (see, e.g., Xu et al 2018c, Tripathi et al 2019b, Abdikamalov et al 2020, Tripathi et al 2021b. For stellarmass BHs, the currently most precise and accurate GR tests are obtained from NuSTAR data of EXO 1846-031 (Tripathi et al 2021c) and GX 339-4 (Tripathi et al 2021b).…”

Section: Testing Einstein's Gravity In the Strong Field Regimesupporting

confidence: 69%

Towards Precision Measurements of Accreting Black Holes Using X-Ray Reflection Spectroscopy

et al. 2021

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Relativistic reflection features are commonly observed in the Xray spectra of accreting black holes. In the presence of high quality data and with the correct astrophysical model, X-ray reflection spectroscopy can be quite a powerful tool to probe the strong gravity region, study the morphology of the accreting matter, measure black hole spins, and possibly test Einstein's theory of general relativity in the strong field regime. In the last decade, there has been significant progress in the development of the

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Section: Testing Einstein's Gravity In the Strong Field Regimesupporting

confidence: 69%

Towards Precision Measurements of Accreting Black Holes Using X-Ray Reflection Spectroscopy

et al. 2021

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“…2 and Fig. 3 therein), which are the updated versions of the same in Cao et al (2018) Xu et al (2018) on the lowmass X-ray binary GS 1354-645 NuSTAR FPM analyses are stronger than ours here. Note that one of systematic effects that affects the uncertainty in deformation parameter values is the ISCO (innermost stable circular orbit) radius degeneracy be- Table 2 Best-fit parameter values obtained employing models A to D with only deformation parameter α 13 = 0.…”

Section: Resultssupporting

confidence: 51%

“…In general, inclusion of other observations may provide more data. But this does not necessarily imply better constraints, since at some point systematic uncertainties dominate over statistical uncertainties (See e.g., Xu et al 2018;Tripathi et al 2018a;Zhang et al 2019).…”

Section: Datamentioning

confidence: 99%

Testing the Kerr Metric with X-Ray Reflection Spectroscopy of Mrk 335 Suzaku Data

Choudhury

Nampalliwar

Abdikamalov

et al. 2019

ApJ

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Einstein's gravity has undergone extensive tests in the weak field gravitational limit, with results in agreement with theoretical predictions. There exist theories beyond general relativity (GR) which modify gravity in the strong field regime but agree with GR in the weak field. Astrophysical black holes are believed to be described by the Kerr metric and serve as suitable candidates to test strong gravity with electromagnetic radiation. We perform such a test by fitting one Suzaku dataset of the narrowline Seyfert 1 (NLS1) galaxy Mrk 335 with X-ray reflection spectroscopy, using the Johannsen metric to model the black hole spacetime and test for deviations from Kerr. We find the data is best modeled with a hybrid model that includes both partial covering absorption and a reflection component. This is the first time such a model has been proposed for a high-flux (low reflection) Mrk 335 dataset. We constrain the Johannsen deformation parameter α 13 to −1.5 < α 13 < 0.6 with spin parameter a * > 0.8, and the α 22 parameter to −0.4 < α 22 < 2.1 with a * > 0.7, both at the 99% confidence level. Although additional solutions at large deviations from the Kerr metric show statistical similarity with the ones above, further analysis suggests these solutions may be manifestations of uncertainties beyond our control and do not represent the data. Hence, our results are in agreement with the idea that the supermassive compact object at the center of Mrk 335 is described by the Kerr metric.

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“…We have extended this model to RELXILL_NK, which can calculate the reflection spectrum for non-Kerr metrics [15,16]. The model has been applied to x-ray observations of several astrophysical BHs to place constraints on deviations away from the Kerr solution [17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Testing general relativity with x-ray reflection spectroscopy: The Konoplya-Rezzolla-Zhidenko parametrization

et al. 2020

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X-ray reflection spectroscopy is a promising technique for testing general relativity in the strong-field regime as it can be used to test the Kerr black hole hypothesis. In this context, the parametrically deformed black hole metrics proposed by Konoplya, Rezzolla, and Zhidenko [Phys. Rev. D 93, 064015 (2016)] form an important class of non-Kerr black holes. We implement this class of black hole metrics in RELXILL_NK, which is a framework we have developed for testing for non-Kerr black holes using x-ray reflection spectroscopy. We perform a qualitative analysis of the effect of the leading order strong-field deformation parameters on typical observables like the innermost stable circular orbits and the reflection spectra. We also present the first x-ray constraints on some of the deformation parameters of this metric, using Suzaku data from the supermassive black hole in Ark 564, and compare them with those obtained (or expected) from other observational techniques like gravitational waves and black hole imaging.

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A Study of the Strong Gravity Region of the Black Hole in GS 1354–645

Cited by 52 publications

References 45 publications

Towards Precision Measurements of Accreting Black Holes Using X-Ray Reflection Spectroscopy

Towards Precision Measurements of Accreting Black Holes Using X-Ray Reflection Spectroscopy

Testing the Kerr Metric with X-Ray Reflection Spectroscopy of Mrk 335 Suzaku Data

Testing general relativity with x-ray reflection spectroscopy: The Konoplya-Rezzolla-Zhidenko parametrization

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