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Spiral galaxy's dark halo puts theorists in a spin

机译:旋涡星系的黑暗光晕使理论家陷入混乱

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The Pinwheel Galaxy is a darker place than we suspected. Other large spiral galaxies, such as the Milky Way, boast star-speckled outer shells. But the edges of the Pinwheel are mysteriously barren, putting a wrinkle in one of the most widely held theories of galaxy growth. We think galaxies get bigger by snacking on dwarf galaxies that fall into their gravitational grasp. This process rips the dwarf galaxies apart and, over billions of years, they leave behind a faint halo of orphaned stars that surrounds the larger galaxy. We have seen such haloes around the Milky Way and our closest large neighbour Andromeda, and simulations suggest that they should be common across the universe. But the most detailed measurement yet of mass distribution in the Pinwheel Galaxy has revealed that its edges are strangely devoid of stars (Astrophysical Journal Letters, doi.org/rbg). This implies that the galaxy has somehow grown large without feeding on many dwarfs, says study author Pieter van Dokkum at Yale University.
机译:风车星系比我们想象的要黑暗的地方。其他大型旋涡星系,例如银河系,拥有星状斑点的外壳。但是风车的边缘神秘地贫瘠,在最广泛使用的星系增长理论之一中产生了皱纹。我们认为,银河系会因在重力控制下的矮星系吃零食而变得更大。这个过程将矮星系撕裂开来,并且在数十亿年的时间里,它们留下了环绕较大星系的微弱的孤立星晕。我们已经在银河系和我们最近的大邻居仙女座附近看到了这样的光环,模拟表明它们在整个宇宙中应该是共同的。但风车星系中质量分布的最详细测量结果表明,其边缘奇怪地没有恒星(Astrophysical Journal Letters,doi.org / rbg)。耶鲁大学的研究作者彼得·范·多姆库姆(Pieter van Dokkum)说,这意味着星系已经以某种方式扩大了,没有以许多小矮星为食。

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    《New scientist》 |2014年第2955期|16-16|共1页
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  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
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  • 正文语种 eng
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