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The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge

机译：Terzan 5星团，是银河凸起原始构造块的残迹

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摘要

绕银河系运转的球状星团，被认为是我们所掌rn握的最接近于具有统一年龄和相同组成、记录rn了自我们银河系诞生以来恒星演化历史的星rn群。不过，这些星团中最亮的一个“ω Centaruri”rn长期以来被认为是这一趋势的一个例外，它包rn含多个星群，这些星群在铁含量及年龄上相差rn很大。两个小组在本期Nature上报告，他们发rn现了更多含有不同星群的球状星团。Lee等人rn证实了这样一个怀疑：巨型球状星团M22包含rn多个具有不同钙含量的各自截然不同的星群。rn同类星团中几个其他星团也是如此。Ferraro等rn人报告，Terzan 5(“银河系核球”中一个与球rn状星团相似的体系)包含两个具有不同铁含量rn和年龄的星群。这些发现表明，ω Cen、M22、rnTerzan 5和其他相似星团是合并之后最终形成rn银河系的矮星系和其他原始天体的遗迹。%Globular star clusters are compact and massive stellar systems old enough to have witnessed the entire history of our Galaxy, the Milky Way. Although recent results suggest that their formation may have been more complex than previously thought, they still are the best approximation to a stellar population formed over a relatively short timescale (less than 1 Gyr) and with virtually no dispersion in the iron content. Indeed, only one cluster-like system (to Centauri) in the Galactic halo is known to have multiple stellar populations with a significant spread in iron abundance and age. Similar findings in the Galactic bulge have been hampered by the obscuration arising from thick and varying layers of interstellar dust. Here we report that Terzan 5, a globular-cluster-like system in the Galactic bulge, has two stellar populations with different iron contents and ages. Terzan 5 could be the surviving remnant of one of the primordial building blocks that are thought to merge and form galaxy bulges.
机译：绕银河系运转的球状星团，被认为是我们所掌rn握的最接近于具有统一年龄和相同组成、记录rn了自我们银河系诞生以来恒星演化历史的星rn群。不过，这些星团中最亮的一个“ω Centaruri”rn长期以来被认为是这一趋势的一个例外，它包rn含多个星群，这些星群在铁含量及年龄上相差rn很大。两个小组在本期Nature上报告，他们发rn现了更多含有不同星群的球状星团。Lee等人rn证实了这样一个怀疑：巨型球状星团M22包含rn多个具有不同钙含量的各自截然不同的星群。rn同类星团中几个其他星团也是如此。Ferraro等rn人报告，Terzan 5(“银河系核球”中一个与球rn状星团相似的体系)包含两个具有不同铁含量rn和年龄的星群。这些发现表明，ω Cen、M22、rnTerzan 5和其他相似星团是合并之后最终形成rn银河系的矮星系和其他原始天体的遗迹。%Globular star clusters are compact and massive stellar systems old enough to have witnessed the entire history of our Galaxy, the Milky Way. Although recent results suggest that their formation may have been more complex than previously thought, they still are the best approximation to a stellar population formed over a relatively short timescale (less than 1 Gyr) and with virtually no dispersion in the iron content. Indeed, only one cluster-like system (to Centauri) in the Galactic halo is known to have multiple stellar populations with a significant spread in iron abundance and age. Similar findings in the Galactic bulge have been hampered by the obscuration arising from thick and varying layers of interstellar dust. Here we report that Terzan 5, a globular-cluster-like system in the Galactic bulge, has two stellar populations with different iron contents and ages. Terzan 5 could be the surviving remnant of one of the primordial building blocks that are thought to merge and form galaxy bulges.

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  • 来源
    《Nature》 |2009年第7272期|483-486|共4页
  • 作者

    F. R. Ferraro; E. Dalessandro; A. Mucciarelli; G. Beccari; R. M. Rich; L. Origlia; B. Lanzoni; R. T. Rood; E. Valenti; M. Bellazzini; S. M. Ransom; G. Cocozza;

  • 作者单位

    Department of Astronomy, University of Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    Department of Astronomy, University of Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    Department of Astronomy, University of Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    ESA, Space Science Department, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands;

    Department of Physics and Astronomy, Math-Sciences 8979, UCLA, Los Angeles, California 90095-1562, USA;

    IFMAF-Osservatorio Astronomico di Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    Department of Astronomy, University of Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    Astronomy Department, University of Virginia, PO Box 400325, Charlottesville, Virginia 22904, USA;

    European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago, Chile Pontifida Universidad Catolica de Chile, Departamento de Astronomia, Avda Vicuna Mackenna 4860, 782-0436 Macul, Santiago, Chile;

    IFMAF-Osservatorio Astronomico di Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

    National Radio Astronomy Observatory, Charlottesville, Virginia 22903, USA;

    IFMAF-Osservatorio Astronomico di Bologna, Via Ranzani, 1, 40127 Bologna, Italy;

  • 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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