Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies

Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies
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预测可能的长寿低质量第一恒星的位置:卫星矮星系的重要性

DOI:
10.1093/mnras/stx2729
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发表时间:
2018
影响因子:
4.8
通讯作者:
他5名
他5名
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Magg;M.;Hartwig;T.;他5名

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到目前为止,对无金属恒星的搜索一直不成功,这证明如果有第一代幸存的恒星,它们是罕见的,它们已经被污染了,或者我们一直在错误的地方寻找。为了预测第三星族(Pop III)幸存者的可能位置,我们半解析地模拟了类银河系星系及其环境中祖先星系的早期星星形成。我们的模型基于高分辨率暗物质模拟套件Caterpillar的合并树。辐射和化学反馈的考虑自洽,基于晕的空间分布。我们的研究结果与今天在银河系中未检测到Pop III幸存者的情况一致。我们发现,可能幸存的Pop III恒星在银河系卫星中比在主银河系中更常见。特别是,低质量的银河系卫星包含的Pop III恒星比银河系大得多。这些邻近的低质量银河系卫星是未来寻找Pop III幸存者的有希望的目标,特别是对于高分辨率,高信噪比的光谱观测。我们提供了所有已知的银河系卫星在红巨星分支阶段发现Pop III幸存者的概率,以指导未来的观测。
The search for metal-free stars has so far been unsuccessful, proving that if there are surviving stars from the first generation, they are rare, they have been polluted or we have been looking in the wrong place. To predict the likely location of Population III (Pop III) survivors, we semi-analytically model early star formation in progenitors of Milky Way-like galaxies and their environments. We base our model on merger trees from the high-resolution dark matter only simulation suiteCaterpillar. Radiative and chemical feedback are taken into account self-consistently, based on the spatial distribution of the haloes. Our results are consistent with the non-detection of Pop III survivors in the Milky Way today. We find that possible surviving Pop III stars are more common in Milky Way satellites than in the main Galaxy. In particular, low-mass Milky Way satellites contain a much larger fraction of Pop III stars than the Milky Way. Such nearby, low-mass Milky Way satellites are promising targets for future attempts to find Pop III survivors, especially for high-resolution, high signal-to-noise spectroscopic observations. We provide the probabilities of finding a Pop III survivor in the red giant branch phase for all known Milky Way satellites to guide future observations.
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