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Researchers find black hole in globular cluster

Last year when researchers discovered two black holes in a globular cluster, they weren't sure if their presence was a common occurrence or a unique stroke of luck

2013-11-06
(Press-News.org) Contact information: Tom Oswald
tom.oswald@cabs.msu.edu
517-432-0920
Michigan State University
Researchers find black hole in globular cluster Last year when researchers discovered two black holes in a globular cluster, they weren't sure if their presence was a common occurrence or a unique stroke of luck Last year when a team of astronomers led by a Michigan State University professor discovered two black holes in a collection of stars known as a globular cluster, they weren't sure if their presence was a common occurrence or a unique stroke of luck.

Researchers are now thinking it was the former, as evidence of yet another black hole has been found in a globular cluster by an MSU-led team of researchers.

As published in the recent issue of Astrophysical Journal, a new black hole candidate has been found in a globular cluster known as M62.

"This implies that the discovery of the other black hole, in the globular cluster called M22, was not just a fluke," said Laura Chomiuk, team member and MSU assistant professor of physics and astronomy. "Black holes really may be common in globular clusters."

Black holes are stars that have died, collapsed into themselves and now have such a strong gravitational field that not even light can escape from them.

The globular cluster M62 is located in the constellation Ophiuchus, about 22,000 light years from Earth.

Until recently, astronomers had assumed that the black holes did not occur in globular clusters, which are some of the oldest and densest collections of stars in the universe. Stars are packed together a million times more closely than in the neighborhood of our sun.

There are so many stars in such a condensed area that they often interact with one another. Massive black holes would have the most violent encounters, "sling-shotting" each other out of the cluster.

Last year's discovery of a pair of black holes in a cluster was especially surprising, Chomiuk said. It had been thought that if two black holes dwelled at the center, they would regularly encounter one another until one shoved the other out.

"I think it's safe to say that we have discovered a whole new hunting ground for black holes," said Chomiuk.

This latest discovery was made by using the National Science Foundation's Karl G. Jansky Very Large Array telescope in New Mexico.

INFORMATION:

To view the paper, visit http://iopscience.iop.org/0004-637X/777/1/69/article.

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[Press-News.org] Researchers find black hole in globular cluster
Last year when researchers discovered two black holes in a globular cluster, they weren't sure if their presence was a common occurrence or a unique stroke of luck