Radio waves from black hole detected
For the first time, scientists have become able to detect the radio waves originating from a mid-sized black hole, referred as the HLX-1. This black whole is situated around 300 million light years away in a galaxy named ESO 243-49.
Sean Farrell from the University of Sydney's School of Physics and his team of researchers which detected the signals said these also allow them to presume the size of the newly discovered black hole.
"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," the journal Nature has quoted Farrel as saying.
"Astronomers have classified black holes into stellar mass black holes, which are up to tens of times the mass of our sun, and super massive black holes, which are millions to billions of times the mass of our sun," said Farrell in a Sydney statement.
"HLX-1 lies in between these two sizes at around 20,000 times the mass of our sun. So we've called it an intermediate mass black hole," Farrell added.
"HLX-1 is located in a galaxy called ESO 243-49 about 300 million light years away from us," he explained.
A team of scientist that includes scientists from France, Britain and the US used the Australia Telescope Compact Array and NASA's Swift satellite to detect radio emissions during two state transitions of the black hole HLX-1 in 2010 and 2011.
Emil Lenc, Farrell's counterpart at the School of Physics, said: "So, what we tend to see is the X-ray emission and then, a day or two or even a few days later, the source flares up in radio waves."
--with inputs from IANS
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