参考资料

Scientists have measured the mass of M82 X-1, a black hole of about 428 solar masses, using NASA's Chandra X-ray Observatory and Hubble Space Telescope. This is one of the few confirmed intermediate-mass black holes, which are harder to detect than supermassive or stellar-mass black holes.

Abstract. By using ASCA and Chandra, we discovered a bright X-ray source M82 X-1 in the starburst galaxy M82. The peak luminosity of ∼1× 10 41 ergs sec-1 and the location of off-center position of M82 in the starburst galaxy M82 suggest that M82 X-1 is a new type of black hole, intermediate massive black hole (IMBH). We also found an expanding molecular super bubble (EMSB) surrounding the IMBH.

M82 X-1. A ground-based view of M82. X-ray views from Chandra X-Ray Observatory show a flare-up from the possible black hole. The black hole is just to the right of the green cross, which marks the galaxy's center. It is much brighter in the second view than the first.