A Cloudy Mystery


Mysterious galactic cloud is the black object on the left. Galactic center is the bright spot on the right. Credit: NASA/Spitzer/Benjamin et al., Churchwell et al.

Mysterious galactic cloud is the black object on the left. Galactic center is the bright spot on the right. Credit: NASA/Spitzer/Benjamin et al., Churchwell et al.

It’s the mystery of the curiously dense cloud. And astronomers at the California Institute of Technology (Caltech) are on the case.

Near the crowded galactic center, where billowing clouds of gas and dust cloak a supermassive black hole three million times as massive as the sun—a black hole whose gravity is strong enough to grip stars that are whipping around it at thousands of kilometers per second—one particular cloud has baffled astronomers. Indeed, the cloud, dubbed G0.253+0.016, defies the rules of star formation.

According to conventional wisdom, clouds of gas that are this dense should clump up to create pockets of even denser material that collapse due to their own gravity and eventually form stars. One such gaseous region famed for its prodigious star formation is the Orion Nebula. And yet, although the galactic-center cloud is 25 times denser than Orion, only a few stars are being born there—and even then, they are small. In fact, the Caltech astronomers say, its star-formation rate is 45 times lower than what astronomers might expect from such a dense cloud.

“It’s a very dense cloud and it doesn’t form any massive stars—which is very weird,” says Jens Kauffmann, a senior postdoctoral scholar at Caltech.

Full Story: http://www.caltech.edu/content/cloudy-mystery

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