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Ultraluminous X-ray Source

(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)