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Too small to ignore

机译:太小而不能忽略

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摘要

A study of one galaxy's dynamics backs up previous claims that surprisingly compact galaxies existed in the early Universe. But how such objects blew up in size to form present-day galaxies remains a puzzle.rnGiant red elliptical galaxies are the oldest and most massive assemblies of stars in the nearby Universe. Large optical telescopes have tracked their evolution back through 11 billion years - about 80% of the Universes lifetime - by observing them at large cosmological red-shifts~(1-3). Observations seemed to indicate that nothing much had happened to them over this time, except that they grew rarer in the more distant past. It was thus a surprise when astronomers discovered recently that these galaxies have grown in size by a factor of five over this period while barely changing in mass. This is like suddenly discovering that Roman Londinium had the same population as Greater London does today. This extreme size and density evolution was not predicted by theories of galaxy formation, and remains difficult to explain.
机译:对一个星系动力学的研究支持了先前的说法,即早期宇宙中存在令人惊讶的紧凑星系。但是这些物体如何爆炸以形成当今的星系仍然是一个谜。巨大的红色椭圆星系是附近宇宙中最古老,质量最大的恒星集合。大型光学望远镜通过观测它们在大宇宙学的红移〜(1-3)的情况下,可追溯到110亿年,即宇宙寿命的80%。观察结果似乎表明,在这段时间里他们并没有发生太大的事情,只是在更遥远的过去它们变得越来越稀有。因此,令人惊讶的是,最近天文学家发现这些星系在此期间的大小增加了五倍,而质量却几乎没有变化。这就像突然发现罗马伦丁堡的人口与今天的大伦敦一样。银河系形成理论并没有预测到这种极端的大小和密度演变,并且仍然难以解释。

著录项

  • 来源
    《Nature》 |2009年第7256期|694-695|共2页
  • 作者

    Karl Glazebrook;

  • 作者单位

    Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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