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Quasars


Papers
  1. Largest Black Holes Yet Found (Time.com)
      "The smaller one, located inside a galaxy known as NGC 3842, is as massive as 9.7 billion suns, and the other, in a galaxy called NGC 4889, is more than twice as large: if you put it on a very large balance, it would take at least 21 billion stars to even things out. Another way to think about things: even the smaller of the two is nearly 30% bigger than the previous record holder, announced last winter, and it would make for a great storyline if astronomers were surprised, amazed, flabbergasted, blown away by the awesome giganticness of these monsters."

      "Nowadays, everyone pretty much agrees that quasars are supermassive black holes at the cores of young galaxies. The holes themselves aren't visible, of course, but when they suck in surrounding matter, the stuff heats up to millions of degrees, sending bursts of energy shooting across the cosmos."

      "Back when the universe was young, there was plenty of gas floating around to feed these monsters. Nowadays, much of it the gas is gone, and so are the quasars but the black holes that powered them should, as Loeb says, still be around (where would they go, after all?)." 12-11

  2. Quasars (Wikipedia.org)
      "A quasar (from quasi-stellar radio source) is an astronomical object that looks like a star in optical telescopes (i.e. it is a point source), and has a very high redshift. The general consensus is that this high redshift is cosmological, the result of Hubble's law, which implies that quasars must be very distant and must emit more energy than dozens of normal galaxies."

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