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POPSFinding the weight of black holes This is a composite image of data from NASA’s Chandra X-ray Observatory (shown in purple) and Hubble Space Telescope (blue) of the giant elliptical galaxy, NGC 4649, located about 51 million light-years from Earth.
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POPSHungry, hungry black holes The conclusion comes from a large observing campaign of the spiral galaxy M81, which is about 12 million light-years from Earth. In the center of M81 is a black hole that is about 70 million times more massive than the Sun, and generates energy and radiation as it pulls gas in the central region of the galaxy inwards at high speed.
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POPSSupermassive black hole says sayonara "In their study, Stefanie Komossa and her colleagues at the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, examined the spectrum of light from a quasar, a brilliant beacon with the unwieldy name SDSS J092712.65+294344.0. Quasars, which lie at the center of galaxies, are fueled by black holes. An analysis of the quasar spectrum reveals a pattern of light emission that matches that expected from a supermassive black hole shot out of the galaxy’s center, the team reports in the May 10 Astrophysical Journal Letters."
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