New Voracious Black Holes Found With X-Ray Telescope In Early Universe

Posted: June 16, 2011 in Space

ANN ARBOR, Mich.—Using the deepest X-ray image ever taken, a University of Michigan astronomer and her colleagues have found the first direct evidence that massive black holes were common in the early universe. This discovery from NASA’s Chandra X-ray Observatory shows that very young black holes grew more aggressively than previously thought, in tandem with the growth of their host galaxies.

By pointing Chandra at a patch of sky for over six weeks, astronomers obtained what is known as the Chandra Deep Field South (CDFS). When combined with very deep optical and infrared images from NASA’s Hubble Space Telescope, the new Chandra data allowed astronomers to search for black holes in 200 distant galaxies, from when the universe was between about 800 million and 950 million years old.

“We had reason to expect that black holes existed in many of the very first galaxies, but they had evaded our searches until now. When I compared Chandra’s data to my theoretical models I was stunned by their agreement. It’s the dream of any theoretician,” said Marta Volonteri, a U-M associate professor of astronomy and co-author of the study that appears in this week’s Nature.

The super-sized growth means that the black holes in the CDFS are related to quasars, very luminous, rare objects powered by material falling onto supermassive black holes. However, the sources in the CDFS are about a hundred times fainter, and the black holes are about a thousand times less massive than the ones in quasars.

It was found that between 30 percent and 100 percent of the distant galaxies contain growing supermassive black holes. Extrapolating these results from the small observed field to the full sky, there are at least 30 million supermassive black holes in the early Universe. This is a factor of 10,000 larger than the estimated number of quasars in the early Universe.

 

Full Article : http://members.beforeitsnews.com/story/720/718/New_Voracious_Black_Holes_Found_With_X-Ray_Telescope_In_Early_Universe.html

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