PMO OpenIR  > 星系中的恒星形成研究团组
Inefficient star formation in extremely metal poor galaxies
Shi, Yong1,2; Armus, Lee3; Helou, George3; Stierwalt, Sabrina4; Gao, Yu5,6; Wang, Junzhi7; Zhang, Zhi-Yu8; Gu, Qiusheng1,2
Source PublicationNATURE
AbstractThe first galaxies contain stars born out of gas with few or no 'metals' (that is, elements heavier than helium). The lack of metals is expected to inhibit efficient gas cooling and star formation(1,2), but this effect has yet to be observed in galaxies with an oxygen abundance (relative to hydrogen) below a tenth of that of the Sun(2-4). Extremely metal poor nearby galaxies may be our best local laboratories for studying in detail the conditions that prevailed in low metallicity galaxies at early epochs. Carbon monoxide emission is unreliable as a tracer of gas at low metallicities(5-7), and while dust has been used to trace gas in low-metallicity galaxies(5,8-10), low spatial resolution in the far-infrared has typically led to large uncertainties(9,10). Here we report spatially resolved infrared observations of two galaxies with oxygen abundances below ten per cent of the solar value, and show that stars formed very inefficiently in seven star-forming clumps in these galaxies. The efficiencies are less than a tenth of those found in normal, metal rich galaxies today, suggesting that star formation may have been very inefficient in the early Universe.
WOS HeadingsScience & Technology
Indexed BySCI
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000342988600044
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
4.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
6.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
7.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
8.Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland
Recommended Citation
GB/T 7714
Shi, Yong,Armus, Lee,Helou, George,et al. Inefficient star formation in extremely metal poor galaxies[J]. NATURE,2014,514(7522):335-+.
APA Shi, Yong.,Armus, Lee.,Helou, George.,Stierwalt, Sabrina.,Gao, Yu.,...&Gu, Qiusheng.(2014).Inefficient star formation in extremely metal poor galaxies.NATURE,514(7522),335-+.
MLA Shi, Yong,et al."Inefficient star formation in extremely metal poor galaxies".NATURE 514.7522(2014):335-+.
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