报告人：Prof. Roberto Soria（NAOC/UCAS/University of Sydney）
题目：Masses of Stellar Black Holes
Kinematic mass measurements of Galactic black holes give masses between 5 and 15 times solar. However, that is based on a small sample of about 20 black holes in bright X-ray binaries. It may not be representative of the true distribution of stellar black hole masses and may bias theoretical models of core collapse supernovae. Ultraluminous X-ray sources might show a population of heavier stellar mass black holes in the local universe; however, so far there is no direct evidence to support this speculation. LIGO merger events do prove the existence of stellar black holes of a few 10s of solar masses, but the merger progenitors cannot be directly confirmed with spectroscopic observations. A breakthrough with the first kinematic mass measurement of a heavy stellar black hole comes from a Galactic binary system, recently discovered by our NAOC team from a LAMOST survey. I will present the evidence for the unusually heavy black hole mass and invite a discussion of possible scenarios.