Belching Black Hole Proves a Biggie: First Known 'Middleweight' Black Hole
ScienceDaily (July 9, 2012) — Observations with CSIRO's Australia Telescope Compact Array have confirmed that astronomers have found the first known "middleweight" black hole.
Outbursts of super-hot gas observed with a CSIRO radio telescope have clinched the identity of the first known "middleweight" black hole, Science Express reports.
Called HLX-1 ("hyper-luminous X-ray source 1"
, the black hole lies in a galaxy called ESO 243-49, about 300 million light-years away.
Before it was found, astronomers had good evidence for only supermassive black holes -- ones a million to a billion times the mass of the Sun -- and "stellar mass" ones, three to thirty times the mass of the Sun.
http://www.sciencedaily.com/releases/2012/07/120709102720.htm
