Poster abstract details

X-ray transients provide the best evidence for the existence of stellar-mass black holes (BHs), with almost 20 confirmed cases based on dynamical studies. However, these are only the tip of the iceberg of an estimated population of a few thousand BH binaries, which slowly reveals themselves through secular X-ray outbursts. Therefore, new strategies aimed at unveiling this dormant population are clearly needed. The combination of IPHAS, UVEX & 2MASS offers a promising tool to distinguish SXTs from other populations of Halpha emitters. This can provide a shortcut to unveil the new brightest members of the Galactic population of BH binaries.