Evidence from high mass X-ray binaries that Galactic WR components of WR+O binaries end their life with a supernova explosion

Understand

Theoretical population number studies of binaries with at least one black hole (BH) component are obviously depending on whether or not BHs receive a (natal) kick during their formation.

• Several observational facts seem to indicate that indeed BHs receive a kick during their formation.
• In the present paper we discuss additional evidence.
• The progenitors of wind fed high mass X-ray binaries (HMXB) with a BH component (BH HMXB) are WR+OB binaries where the Wolf-Rayet (WR) star will finally collapse and form the BH.