An infrared FWHM–<i>K</i><sub>2</sub> correlation to uncover highly reddened quiescent black holes
An infrared FWHM–<i>K</i><sub>2</sub> correlation to uncover highly reddened quiescent black holes
Among the sample of Galactic transient X-ray binaries (SXTs) discovered to date, about 70 have been proposed as likely candidates to host a black hole. Yet, only 19 have been dynamically confirmed. Such a reliable confirmation requires phase-resolved spectroscopy of their companion stars, which is generally feasible when the system …