V404 Cyg

Black hole 'bull's-eye' sheds light on interstellar dust - University of Leicester
NASA's Swift Reveals a Black Hole Bull's-eye - NASA

The Swift X-ray image of V404 Cyg shows a patch of the sky equal to about half the apparent diameter of the full Moon.
Image credit: NASA's Scientific Visualization Studio (left), Andrew Beardmore (Univ. of Leicester) and NASA/Swift (right).
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Rings of X-ray light centred on a binary system containing an erupting black hole (dot at centre) were imaged by the X-ray Telescope aboard NASA's Swift satellite on June 30. A narrow gap splits the middle ring in two. Colour indicates the energy of the X-rays, with red representing the lowest (800 to 1,500 electron volts, eV), green for medium (1,500 to 2,500 eV), and the most energetic (2,500 to 5,000 eV) shown in blue. For comparison, visible light has energies ranging from about 2 to 3 eV. The dark diagonal lines through the image are artifacts of the imaging system.
Image credit: Andrew Beardmore (Univ. of Leicester) and NASA/Swift.
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Animated image of the expanding rings (described above) created from observations between 30th June and 4th July.
Video credit: Andrew Beardmore (Univ. of Leicester) and NASA/Swift.
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