Supermassive black holes (those with millions to billions of solar-masses) are thought to reside at the centers of most galaxies. These black holes must have undergone periods of intense accretion activity to grow to their large sizes, during which times they would be observed as active galactic nuclei and especially bright in X-rays. The masses of these black holes have been found to correlate closely with the cumulative mass of the stars that surround the galaxy in its bulge (and which are bou...
Supermassive black holes (those with millions to billions of solar-masses) are thought to reside at the centers of most galaxies. These black holes must have undergone periods of intense accretion activity to grow to their large sizes, during which times they would be observed as active galactic nuclei and especially bright in X-rays. The masses of these black holes have been found to correlate closely with the cumulative mass of the stars that surround the galaxy in its bulge (and which are bou...
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