Giant Gamma-ray Bubbles from our local Black Hole
Enormous bubbles of gamma ray radiation may be evidence that the black hole at the centre of our Milky Way may have been very bright in the past...
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Giant Gamma-ray bubbles from Fermi-LAT: Active galactic nucleus activity or bipolar galactic wind? ; Meng Su et al; 2010 ApJ 724 1044 doi: 10.1088/0004-637X/724/2/1044
Pre-release paper at Arxiv, arXiv:1005.5480v3