Islamabad : Astronomers using Nasa’s Chandra X-ray Observatory have found that a super massive black hole at the centre of a group of galaxies about 105 million light years from Earth has erupted multiple times over 50 million years.
Scientists discovered the history of black hole eruptions by studying the group of galaxies named NGC 5813, Science daily reported. The Chandra observations are the longest ever obtained of a galaxy group, lasting for just over a week, researchers said.
Galaxy groups do not contain hundreds or even thousands of galaxies like clusters do, they are typically comprised of 50 or fewer galaxies. Like galaxy clusters, groups of galaxies are enveloped by giant amounts of hot gas that emit X-rays.
The black hole’s spin, coupled with gas spiralling toward the black hole, can produce a rotating, tightly wound vertical tower of magnetic field that flings a large fraction of the inflowing gas away from the vicinity of the black hole in an energetic, high-speed jet. This is the highest number of pairs of cavities ever discovered in either a group or a cluster of galaxies.
