A sky survey image of the massive galaxy NGC 1600, and a Hubble Space Telescope closeup of the bright center of the galaxy where the 17 - billion - solar - mass black hole — or binary black hole — resides. (sciencedaily.com)
The bright center of the galaxy is thought to be caused by the ejection of huge amounts of super-hot gas from the region around a central black hole. (constellation-guide.com)
He and his colleagues focused on the K - alpha emission line of iron, visible in the spectra of many active galactic nuclei (AGN)-- the brilliant centers of these galaxies. (sciencemag.org)