Black hole found in binary star system: More than five times greater in mass than our Sun
Friday, March 25, 2011 - 15:32
in Astronomy & Space
The Gran Telescopio Canarias (GTC) has obtained the first spectroscopy data from the X-ray transient binary XTE J1859+226, which confirm the existence of a black hole. Only about 20 binary stellar systems are known to contain a black hole, out of an estimated population of around 5,000 in the Milky Way Galaxy.