28.docx - Description[edit] Supermassive black holes are...

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Description[edit]Supermassive black holes are classically defined as black holeswith a mass above 0.1 million to 1 million M.[9]Some astronomers have begun labeling black holes of at least 10 billion Mas ultramassive black holes.[10][11]Most of these (such as TON 618) are associated with exceptionally energetic quasars. Even larger ones have been dubbed stupendously large black holes (SLAB) with masses greater than 100 billion M.[12]Although they noted there is currently no evidence that stupendously large black holes are real, they noted that supermassive black holes almost that size do exist.[13]Some studies have suggested that the maximum mass that a black hole can reach, while being luminous accretors, is of the order of ~50 billion M.[14][15]Supermassive black holes have physical properties that clearly distinguish them from lower-mass classifications. First, the tidal forcesin the vicinity of the event horizonare significantly weaker for supermassive black holes. The tidal force on a body at the event horizon is inversely proportional to the square of the mass:[16]

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Black hole, Andromeda Galaxy

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