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ultraluminous X-ray source

(ULX)
(X-ray source with luminosity between a star and an AGN)

An ultraluminous X-ray source (ULX) is a source of X-rays that is not as luminous as an active galactic nucleus but is more luminous than any devised stellar process. It is not clear what they are. A theory is that they are intermediate-mass black holes.


(X-ray,black holes)
http://en.wikipedia.org/wiki/Ultraluminous_X-ray_source

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