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The Sagittarius impact as an architect of spirality and outer rings in the Milky Way

机译：射手座作为银河系中的螺旋度和外圈的建筑师而产生的影响

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摘要

Like many galaxies of its size, the Milky Way is a disk with prominent spiral arms rooted in a central bar1, although our knowledge of its structure and origin is incomplete. Traditional attempts to understand our Galaxy's morphology assume that it has been unperturbed by major external forces. Here we report simulations of the response of the Milky Way to the infall of the Sagittarius2 dwarf galaxy (Sgr), which results in the formation of spiral arms, influences the central bar and produces a flared outer disk. Two ring-like wrappings emerge towards the Galactic anti-Centre in our model that are reminiscent of the low-latitude arcs observed in the same area of the Milky Way.%自其十多年前被发现以来，作为我们银河系一个卫星星系的“人马座矮星系”(Sgr)，已被当作是与据信在整个宇宙中普遍存在的无数合并事件相似的一个“本地事件”。传统上，Sgr被当作是“银河盘”的一个可以忽略的扰动者。
机译：Like many galaxies of its size, the Milky Way is a disk with prominent spiral arms rooted in a central bar1, although our knowledge of its structure and origin is incomplete. Traditional attempts to understand our Galaxy's morphology assume that it has been unperturbed by major external forces. Here we report simulations of the response of the Milky Way to the infall of the Sagittarius2 dwarf galaxy (Sgr), which results in the formation of spiral arms, influences the central bar and produces a flared outer disk. Two ring-like wrappings emerge towards the Galactic anti-Centre in our model that are reminiscent of the low-latitude arcs observed in the same area of the Milky Way.%自其十多年前被发现以来，作为我们银河系一个卫星星系的“人马座矮星系”(Sgr)，已被当作是与据信在整个宇宙中普遍存在的无数合并事件相似的一个“本地事件”。传统上，Sgr被当作是“银河盘”的一个可以忽略的扰动者。

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  • 来源
    《Nature》 |2011年第7364期|p.301-303a25|共4页
  • 作者

    Chris W. Purcell; James S. Bullock; Erik J. Tollerud; Miguel Rocha; Sukanya Chakrabarti;

  • 作者单位

    Department of Physics and Astronomy, The University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA Center for Cosmology, Department of Physics and Astronomy, The University of California, Irvine, California 92697, USA;

    Center for Cosmology, Department of Physics and Astronomy, The University of California, Irvine, California 92697, USA;

    Center for Cosmology, Department of Physics and Astronomy, The University of California, Irvine, California 92697, USA;

    Center for Cosmology, Department of Physics and Astronomy, The University of California, Irvine, California 92697, USA;

    Department of Physics, Florida Atlantic University, Boca Raton, Florida 33431, 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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