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Discrete clouds of neutral gas between the galaxiesM31 and M33

机译：M31和M33星系之间的中性气体离散云

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摘要

Spiral galaxies must acquire gas to maintain their observed level of star formation beyond the next few billion years1. A source of this material may be the gas that resides between galaxies, but our understanding of the state and distribution of this gas is incomplete~2. Radio observations~3 of the Local Group of galaxies have revealed hydrogen gas extending from the disk of the galaxy M31 at least halfway to M33. This feature has been interpreted to be the neutral component of a condensing intergalactic filament~4, which would be able to fuel star formation in M31 and M33, but simulations suggest that such a feature could also result from an interaction between both galaxies within the past few billion years (ref. 5). Here we report radio observations showing that about 50 per cent of this gas is composed of clouds, with the rest distributed in an extended, diffuse component. The clouds have velocities comparable to those of M31 and M33, and have properties suggesting that they are unrelated to other Local Group objects. We conclude that the clouds are likely to be transient condensations of gas embedded in an intergalactic filament and are therefore a potential source of fuel for future star formation in M31 and M33.
机译：未来数十亿年内，旋涡星系必须获取气体以维持其观测到的恒星形成水平1。这种物质的来源可能是存在于星系之间的气体，但我们对这种气体的状态和分布的理解尚不完全2。对银河系局部群的3次无线电观测发现，氢气从银河系M31的圆盘至少延伸到M33的一半。该特征已被解释为是凝结的银河系间长丝〜4的中性成分，它将能够助长M31和M33中恒星的形成，但模拟表明，该特征也可能是由于过去两个星系之间的相互作用而产生的数十亿年（参考资料5）。在这里，我们报告的无线电观测结果表明，这种气体中约有50％由云组成，其余的则分布在扩展的扩散成分中。云的速度可与M31和M33的速度相媲美，并且具有表明它们与其他本地组对象无关的特性。我们得出的结论是，云很可能是星际线中嵌入气体的短暂凝结，因此是未来M31和M33恒星形成的潜在燃料来源。

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  • 来源
    《Nature》 |2013年第7448期|224-226|共3页
  • 作者

    Spencer A. Wolfe; D. J. Pisano; Felix J. Lockman; Stacy S. McGaugh; Edward J. Shaya;

  • 作者单位

    Department of Physics, West Virginia University, PO Box 6315, Morgantown, West Virginia 26506, USA;

    Department of Physics, West Virginia University, PO Box 6315, Morgantown, West Virginia 26506, USA;

    National Radio Astronomy Observatory, PO Box 2, Green Bank, West Virginia 24944, USA;

    Department of Astronomy, Case Western Reserve University, Cleveland, Ohio 44106, USA;

    Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA;

  • 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);
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  • 正文语种 eng
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