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If confirmed, HLX-1 would be classified as an intermediate-type black hole - something astrophysicists suspected to exist, but for which there have been only tentative detections in the past.
Understanding how super-massive black holes form and grow is thus crucial to our comprehension of the formation and evolution of galaxies, which in turn goes part of the way to answering one of the really big questions: how did our own galaxy form and evolve?" said astronomer Sean Farrell, also of the University of Leicester.
the maximum observed 0.2-10 keV luminosity is 1.2 × 1042 erg s–1. This luminosity is ~400 times above the Eddington limit for a 20 M black hole.