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Theoretical population number studies of binaries with at least one blackhole (BH) component are obviously depending on whether or not BHs receive a(natal) kick during their formation. Several observational facts seem toindicate that indeed BHs receive a kick during their formation. In the presentpaper we discuss additional evidence. The progenitors of wind fed high massX-ray binaries (HMXB) with a BH component (BH HMXB) are WR+OB binaries wherethe Wolf-Rayet (WR) star will finally collapse and form the BH. Starting fromthe observed population of WR+OB binaries in the Solar Neighborhood we predictthe population of wind fed BH HMXBs as a function of the BH-natal kick. Thesimulations reveal that when WR stars collapse into a BH with zero or low kick,we would expect 100 or more wind fed BH HMXBs in the Solar Neighborhood whereasonly one is observed (Cyg X-1). We consider this as evidence that either WRcomponents in binaries end their life as a neutron star or that they collapseinto BHs both accompanied by a supernova explosion imparting significant(natal) kicks.

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