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Highly efficient star formation in NGC 5253 possibly from stream-fed accretion

机译:NGC 5253中高效的恒星形成,可能是由流加料产生的

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Gas clouds in present-day galaxies are inefficient at forming stars. Low star-formation efficiency is a critical parameter in galaxy evolution: it is why stars are still forming nearly 14 billion years after the Big Bang and why star clusters generally do not survive their births, instead dispersing to form galactic disks or bulges. Yet the existence of ancient massive bound star clusters (globular clusters) in the Milky Way suggests that efficiencies were higher when they formed ten billion years ago. A local dwarf galaxy, NGC 5253, has a young star cluster that provides an example of highly efficient star formation. Here we report the detection of the J = 3→2 rotational transition of CO at the location of the massive cluster. The gas cloud is hot, dense, quiescent and extremely dusty. Its gas-to-dust ratio is lower than the Galactic value, which we attribute to dust enrichment by the embedded star cluster. Its star-formation efficiency exceeds 50 per cent, tenfold that of clouds in the Milky Way. We suggest that high efficiency results from the force-feeding of star formation by a streamer of gas falling into the galaxy.
机译:当今星系中的气云在形成恒星方面效率不高。较低的恒星形成效率是银河系演化的关键参数:这就是为什么恒星在大爆炸之后仍形成近140亿年的原因,也是为什么恒星团通常无法生存的原因,而是散布成星系盘或凸起。然而,银河系中存在古老的大规模束缚星团(球状星团)表明,当它们形成于100亿年前时,其效率更高。本地矮星系NGC 5253具有一个年轻的恒星团,提供了高效恒星形成的一个例子。在这里,我们报告了在大规模团簇的位置检测到CO的J = 3→2旋转转变。气体云很热,浓密,静止且尘土飞扬。它的气尘比低于银河系数值,我们将其归因于嵌入式星团的尘埃富集。它的恒星形成效率超过50%,是银河系云层的十倍。我们认为,高效率的产生是由于流入星系的气体流对恒星形成的强迫作用。

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  • 来源
    《Nature》 |2015年第7543期|331-333|共3页
  • 作者单位

    Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095-1547, USA;

    Department of Physics and Astronomy, University of Tel Aviv, 69978 Ramat Aviv, Israel;

    Observational Cosmology Laboratory, Code 665, NASA at Goddard Space Flight Center, Greenbelt, Maryland 20771, USA;

    Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095-1547, USA;

    Academia Sinica, Astronomy and Astrophysics, 11F Astronomy-Mathematics Building, AS/NTU No. 1,Sec.4, Roosevelt Road, Taipei 10617, Taiwan;

    Department of Physics, Caltech, Pasadena, California 91125, USA, Institute for Astrophysics, University of Minnesota, Minneapolis, Minnesota 55405, USA;

    Department of Physics, New Mexico Institute of Mining and Technology, Socorro, New Mexico 85723, USA,National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, New Mexico 85723, USA;

    Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, 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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