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Ultraluminous X-ray source
An "ultra-luminous X-ray source" (ULX) is an astronomical source of X-rays that is not in the nucleus of a galaxy, and is more luminous than 10^{39} erg/s, assuming that it radiates isotropically. Typically there is about one ULX per galaxy in galaxies which host ULXs, but some galaxies contain many ULXs.
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