The discussion centers on HLX-1, identified as the brightest ultra-luminous X-ray source known, and explores its classification as a black hole, its distance from Earth, and the implications of its luminosity. Participants examine the nature of ultra-luminous X-ray sources and their characteristics, including the distinction between stellar-mass black holes and supermassive black holes.
Participants express disagreement regarding the classification of HLX-1 and its distance from Earth. Multiple competing views remain about the nature of ultra-luminous X-ray sources and their characteristics.
There are unresolved assumptions regarding the definitions of black hole classifications and the criteria for ultra-luminous X-ray sources. The discussion does not reach a consensus on the nature of HLX-1.
HLX-1 is in the galaxy ESO 243-49, about 300 million light years from the Earth. It is not at the center of a galaxy; that is one of the hallmarks of an ultraluminous X-ray source. The other hallmark is that they are ultraluminous, which means that their X-ray output exceeds that which would result from a stellar black hole.Philosophaie said:HLX-1 is the brightest ultra-luminous X-ray source known. Also it is not a supermassive black hole but it is the center of the galaxy. How can it be the brightest x-ray source and be a small black hole?