Testing the Kerr black hole hypothesis with GRS 1716-249 by combining the continuum-fitting and the iron-line methods. (arXiv:2106.03086v2 [astro-ph.HE] UPDATED)

Testing the Kerr black hole hypothesis with GRS 1716-249 by combining the continuum-fitting and the iron-line methods. (arXiv:2106.03086v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_Z/0/1/0/all/0/1">Zuobin Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_H/0/1/0/all/0/1">Honghui Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Abdikamalov_A/0/1/0/all/0/1">Askar B. Abdikamalov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ayzenberg_D/0/1/0/all/0/1">Dimitry Ayzenberg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bambi_C/0/1/0/all/0/1">Cosimo Bambi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhou_M/0/1/0/all/0/1">Menglei Zhou</a>

The continuum-fitting and the iron-line methods are currently the two leading
techniques for measuring the spins of accreting black holes. In the past few
years, these two methods have been developed for testing fundamental physics.
In the present work, we employ state-of-the-art models to test black holes
through the continuum-fitting and the iron-line methods and we analyze three
NuSTAR observations of the black hole binary GRS 1716-249 during its outburst
in 2016-2017. In these three observations, the source was in a
hard-intermediate state and the spectra show both a strong thermal component
and prominent relativistic reflection features. Our analysis confirms the Kerr
nature of the black hole in GRS 1716-249 and provides quite stringent
constraints on possible deviations from the predictions of general relativity.

The continuum-fitting and the iron-line methods are currently the two leading
techniques for measuring the spins of accreting black holes. In the past few
years, these two methods have been developed for testing fundamental physics.
In the present work, we employ state-of-the-art models to test black holes
through the continuum-fitting and the iron-line methods and we analyze three
NuSTAR observations of the black hole binary GRS 1716-249 during its outburst
in 2016-2017. In these three observations, the source was in a
hard-intermediate state and the spectra show both a strong thermal component
and prominent relativistic reflection features. Our analysis confirms the Kerr
nature of the black hole in GRS 1716-249 and provides quite stringent
constraints on possible deviations from the predictions of general relativity.

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