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Scientists discover two black holes inside a star cluster

Raw Story

This NASA Spitzer Space Telescope handout image obtained in 2009 shows the center of our Milky Way Galaxy hidden from the prying eyes of optical telescopes by clouds of obscuring dust and gas. (AFP Photo)

Astronomers said Wednesday they had found evidence of something they never expected to see — two black holes lurking inside a 12-billion-year-old cluster of tightly-packed stars in our Milky Way galaxy.

The international team was taken by surprise when noting what appeared to be two black holes, each about 10 to 20 times more massive than our Sun, near the core of a star cluster named Messier 22 (M22), they wrote in Nature.

The finding challenges much of the accepted science on globular star clusters, which are about 10 billion years old on average and contain around a million stars.

Theorists had believed that no more than one matter-sucking black hole could exist in a globular cluster, of which there are dozens in the Milky Way.

“We were searching for one large black hole in the middle of the cluster, but instead found two smaller black holes a little way out from the centre,” study co-author James Miller-Jones from the International Centre for Radio Astronomy Research said of the “very surprising” find.

This meant that “all the theory and simulations need refinement,” he added.

Simulations of cluster evolution had shown that many black holes are created early in a cluster’s history.

Scientists had believed the black holes sink towards the middle of the cluster where they start a gravitational “dance” — most of them being flung out of the cluster with only one remaining.

But the team said their evaluation of X-ray, radio, optical and infrared images of M22 led them to conclude that the objects they spotted were indeed black holes.

Black holes are very dense regions in spacetime with a gravitational force so strong that even light cannot escape. Scientists who study them hope to learn more about the evolution of galaxies.

A black hole is what is left when a massive star dies and collapses in on itself.

Commenting on the paper, Stefan Umbreit of the Northwestern University in Illinois’ astrophysics centre wrote in Nature that the team’s interpretation of the data was “compelling”.

If correct, the pair of black holes in M22 are the first to be found in a globular cluster in our galaxy. M22 is about 10,000 light years from Earth.

“M22 may contain as many as 100 black holes but we can’t detect them unless they’re actively feeding on nearby stars,” Miller-Jones said in a statement.

Black holes normally lurk dormant and undetected at the centre of galaxies, but can occasionally be tracked by the scraps left over when they feast on stars that venture too close.

View the original article at Raw Story.

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