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arXiv 0807.4634astro-ph
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搜寻人口III星

The search for Population III stars

Sperello di Serego Alighieri, Jaron Kurk, Benedetta Ciardi, Andrea Cimatti, Emanuele Daddi, Andrea Ferrara

摘要:

第三星族恒星是由原始大爆炸物质形成的第一代恒星,具有头重脚轻的IMF,应该对宇宙再电离做出重大贡献,它们对于理解星系早期金属富集至关重要。因此,这些被理论预见的物体被观测发现是非常重要的。然而,通过HeII 1640A线签名搜索的PopIII恒星仍然难以捉摸。我们报告的搜索在z=6.5,这是一个非常有前途的候选人的星系中的HeII线。不幸的是,我们还不能显示搜索结果。然而,我们提请注意在z=3.4的透镜HII矮星系中可能检测到PopIII恒星,这在几年前的文献中出现过,但被忽视了。

英文摘要:

Population III stars, the first generation of stars formed from primordial Big Bang material with a top-heavy IMF, should contribute substantially to the Universe reionization and they are crucial for understanding the early metal enrichment of galaxies. Therefore it is very important that these objects, foreseen by theories, are detected by observations. However PopIII stars, searched through the HeII 1640A line signature, have remained elusive. We report about the search for the HeII line in a galaxy at z=6.5, which is a very promising candidate. Unfortunately we are not yet able to show the results of this search. However we call attention to the possible detection of PopIII stars in a lensed HII dwarf galaxy at z=3.4, which appeared in the literature some years ago, but has been overlooked.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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