Carbon monoxide in an extremely metal-poor galaxy.

Carbon monoxide in an extremely metal-poor galaxy.
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金属极度贫乏的星系中的一氧化碳

DOI:
10.1038/ncomms13789
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发表时间:
2016-12-09
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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在局部宇宙中,金属丰度低于太阳值10%的极度贫金属的星系是在早期宇宙的准原始环境中研究星际介质的最佳类比。尽管这些星系中的恒星正在形成,但分子气体(已知为我们的银河系等星系中的恒星形成提供了物质储存库)的存在仍然不清楚。本文报道了在太阳金属丰度为7%的星系中探测到分子气体的主要示踪物一氧化碳(CO),并在两个金属丰度较高的星系中进行了额外探测。这种探测提供了直接证据,证明在这些几乎不含金属的星系中存在分子气体。利用存档的红外数据表明,在极低的金属丰度下,每个CO光度的分子气体质量大约是银河系的1000倍。局部宇宙中极度贫金属的星系是在早期宇宙的准原始环境中研究星际介质的最佳类比。在这里,作者探测到一个太阳金属丰度为7%的星系中的CO排放,为分子气体的存在提供了直接证据。
Extremely metal-poor galaxies with metallicity below 10% of the solar value in the local universe are the best analogues to investigating the interstellar medium at a quasi-primitive environment in the early universe. In spite of the ongoing formation of stars in these galaxies, the presence of molecular gas (which is known to provide the material reservoir for star formation in galaxies such as our Milky Way) remains unclear. Here we report the detection of carbon monoxide (CO), the primary tracer of molecular gas, in a galaxy with 7% solar metallicity, with additional detections in two galaxies at higher metallicities. Such detections offer direct evidence for the existence of molecular gas in these galaxies that contain few metals. Using archived infrared data, it is shown that the molecular gas mass per CO luminosity at extremely low metallicity is approximately one-thousand times the Milky Way value. Extremely metal-poor galaxies in the local universe are the best analogues to investigating the interstellar medium at a quasi-primitive environment in the early universe. Here, the authors detect CO emission in a galaxy at 7% solar metallicity, offering direct evidence for the presence of molecular gas.
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