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    • Proof of Principle X-ray Reflection Mass Measurement of the Black Hole in H1743-322

    Edward Nathan,Adam Ingram,James F. Steiner,Ole Koenig,Thomas Dauser,Matteo Lucchini,Guglielmo Mastroserio,Michiel van der Klis,Javier A. Garcia,Riley Connors,Erin Kara,Jingyi Wang

    Monthly Notices of the Royal Astronomical Society（2024）

    CALTECH | Newcastle Univ | Ctr Astrophys Harvard & Smithsonian | Dr Karl Remeis Observ | Univ Amsterdam | Univ Milan | Villanova Univ | MIT

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    Abstract
    The black hole X-ray binary H1743-322 lies in a region of the Galaxy with high extinction, and therefore it has not been possible to make a dynamical mass measurement. In this paper, we make use of a recent model which uses the X-ray reflection spectrum to constrain the ratio of the black hole mass to the source distance. By folding in a reported distance measurement, we are able to estimate the mass of the black hole to be 12 +/- 2 M-circle dot (1 sigma credible interval). We are then able to revise a previous disc continuum fitting estimate of black hole spin a & lowast; (previously relying on a population mass distribution) using our new mass constraint, finding a(& lowast; )= 0.47 +/- 0.10. This work is a proof of principle demonstration of the method, showing it can be used to find the mass of black holes in X-ray binaries.
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    accretion, accretion discs,black hole physics,X-rays: individual: H1743-322
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