Proof of principle X-ray reflection mass measurement of the black hole in H1743-322
Ingram, Adam; Steiner, James F.; García, Javier A.; Kara, Erin; Mastroserio, Guglielmo; Connors, Riley; Dauser, Thomas; Lucchini, Matteo; Wang, Jingyi; Nathan, Edward; van der Klis, Michiel; König, Ole
United States, United Kingdom, Germany, Netherlands, Italy
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 $12\pm 2~\text{M}_\odot {}$ ($1\sigma$ credible interval). We are then able to revise a previous disc continuum fitting estimate of black hole spin $a_*$ (previously relying on a population mass distribution) using our new mass constraint, finding $a_*=0.47\pm 0.10$. 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.