Scientists identified First Radio Waves from Middleweight Black Hole HLX-1

A team of scientists at the University of Sydney on 10 July 2012 discovered the first radio emissions from the middleweightblack hole HLX-1, that lies in a galaxy about 300 million light-years away. The research team had used Compact Array radio telescope from the Commonwealth Scientific and Industrial Research Organization (CSIRO).
HLX-1 (hyper-luminous X-ray source 1), lies in a galaxy called ESO 243-49 about 300 million light-years away. HLX-1 was discovered by chance in 2009, because it stood out as a very bright X-ray source.
Before the discovery of HLX-1, scientists had 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.
As per the new study, the size of HLX-1 is around 20000 times the mass of our sun which makes it an intermediate mass black hole.

Black Holes:

Black holes are areas where the matter is so densely squeezed into a small space, that it makes gravity pull strongly enough to stop light from escaping