Miscellaneous February 16, 2013

Comet_PANSTARRS_Terry_Lovejoy_Australia_HR-300x2141 Six speedy stars rocketing through space at up to 2 million miles per hour were likely ejected from the giant black hole at the Milky Way‘s heart, astronomers say. They represent the first known “hypervelocity stars” with masses similar to that of our sun. The discovery, unveiled last month, could shed light on how stars form in the dust-shrouded core of our home galaxy. Black hole suns The galactic center is cloaked in a halo of dust that obscures all but the brightest stars from astronomers’ telescopes. But hypervelocity stars could provide a window into the star formation going on at the Milky Way‘s dark heart. That’s because hypervelocity stars are thought to form when the supermassive black hole at the center of a galaxy devours one star in a binary system and ejects its twin, flinging it through space at superfast speeds, said study author Keith Hawkins, an astronomy student at Ohio University. “These are incredibly fast-moving objects that are actually gravitationally unbound to the Milky Way,” he said during the 221st annual meeting of the American Astronomical Society in Long Beach, Calif., last month. Though these speed demons may be close to the black hole, they are not shrouded by dust and can be detected with telescopes. Because speedy rogue stars have been ejected from the galactic center, identifying them can reveal the types of star formation occurring there. But until now, Pages: 1 2

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