Binary Black Hole in 3C 75
Credit: X-Ray: NASA / CXC / D. Hudson, T. Reiprich et al. (AIfA);
Radio: NRAO / VLA/ NRL Explanation: What's happening in the middle of this massive galaxy? There, two bright sources at the center of
this composite x-ray (blue)/
radio (pink) image are thought to be co-orbiting supermassive black holes powering the giant radio source
3C 75. Surrounded by multimillion degree x-ray emitting gas, and blasting out
jets of relativistic particles the
supermassive black holes are separated by 25,000 light-years. At the cores of
two merging galaxies in the
Abell 400 galaxy cluster they are some 300 million light-years away.
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