Episode 91: How Bright is a Black Hole
Looking for light that has been traveling for billions of years, cosmologist Xiaohui Fan and his team scan the night sky using telescopes located around the world. They recently found one of the oldest objects in the universe: a huge quasar that existed less than 1 billion years after the Big Bang (which occurred 13.7 billion years ago). Quasars are visible by the light given off as cosmic gas and dust are sucked into the black holes at their centers. This quasar, at the edge of the observable universe, has a black hole the mass of 12 billion suns and appears to have formed faster than current theories can explain. Fan and his team are continuing to search for quasars at even larger cosmic distances at even larger cosmic distances and earlier times, hoping to answer the question: when did the first super-massive black hole form in the universe? In this episode: Xiaohui Fan, Ph.D., Regents' Professor in Astronomy; Leslie P. Tolbert, PhD, Regents' Professor in Neuroscience at the UA