M82 X-1 is an ultra-luminous X-ray source located in the galaxy M82. It is a candidate intermediate-mass black hole, with the exact mass estimate varying from around 100 to 1000 solar masses. One of the most luminous ULXs ever known, its luminosity exceeds the Eddington limit for a stellar mass object.
See also M82 X-2
References
External links Dying Star Reveals More Evidence for New Kind of Black Hole Archived 2021-11-20 at the Wayback Machine A medium-sized black hole? Archived 2010-01-13 at the Wayback Machine