Vol. 586
In section 14. Catalogs and data

BlackCAT: A catalogue of stellar-mass black holes in X-ray transients

by J. M. Corral-Santana, J. Casares, T. Munoz-Darias, et al. A&A 586, A61

The main method used to probe for stellar mass black holes (BHs) is thorough dynamical studies of binary systems. In this paper, Corral-Santana et al. present the most comprehensive catalog of binary BH transients. For each of the 59 transients, the BlackCAT catalog provides astrometric and photometric information for X-ray outbursts and for dynamic determination of BH masses. The observed mass distribution reveals a gap between neutron stars and BHs of between 2–5 solar masses, which confirms that the two classes of objects are different in nature. The total population of BH transients in our Galaxy was estimated as ~1,300 objects. This indicates the potential for a large amount of ongoing research.