The View Near a Black Hole

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zorg.ch #109525 by [z]Barbara Harris @ 20.04.2009 00:00 - nach oben - The View Near a Black Hole Explanation: In the center of a swirling whirlpool of hot gas is likely a beast that has never been seen directly: a black hole. Studies of the bright light emitted by the swirling gas frequently indicate not only that a black hole is present, but also likely attributes. The gas surrounding GRO J1655-40, for example, has been found to display an unusual flickering at a rate of 450 times a second. Given a previous mass estimate for the central object of seven times the mass of our Sun, the rate of the fast flickering can be explained by a black hole that is rotating very rapidly. What physical mechanisms actually cause the flickering -- and a slower quasi-periodic oscillation (QPO) -- in accretion disks surrounding black holes and neutron stars remains a topic of much research. digg_url = 'http://apod.nasa.gov/apod/ap090419.html'; digg_skin = 'compact'; Credit & Copyright