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
复制标题
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
中科院分区:
文献类型:
--
作者:
Magg;M.;Hartwig;T.;他5名
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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DOI:
10.1111/j.1365-2966.2012.21809.x
发表时间:
2012
影响因子:
4.8
作者:
J. Wise;Tom Abel;M. Turk;M. Norman;Britton D. Smith
通讯作者:
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DOI:
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发表时间:
2016
期刊:
影响因子:
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DOI:
10.1051/0004-6361/201731158
发表时间:
2017
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
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作者:
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通讯作者:
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DOI:
10.1088/0004-637x/736/2/147
发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
2013
期刊:
影响因子:
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通讯作者:
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