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(23 Jul 2008 17:00 GMT) - Quasars are the brilliant cores of remote galaxies, thought to be powered by supermassive black holes accreting surrounding gas. Central to this picture is a putative accretion disk which is believed to be the source of the majority of the radiative output. A paper in the current issue of Nature by a team of scientists, led by Makoto Kishimoto of the Max Planck Institute for Radioastronomy, verifies a long-standing prediction about the intensely luminous radiation emitted by these accretion disks…
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