Inefficient star formation in extremely metal poor galaxies
文献类型：期刊论文
| 作者 | Shi, Yong1,2; Armus, Lee3; Helou, George3; Stierwalt, Sabrina4; Gao, Yu5,6 ; Wang, Junzhi7; Zhang, Zhi-Yu8; Gu, Qiusheng1,2
|
| 刊名 | NATURE
 |
| 出版日期 | 2014-10-16 |
| 卷号 | 514期号:7522页码:335-+ |
| ISSN号 | 0028-0836 |
| 英文摘要 | The 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标题词 | Science & Technology |
| 类目[WOS] | Multidisciplinary Sciences |
| 研究领域[WOS] | Science & Technology - Other Topics |
| 关键词[WOS] | CO-TO-H-2 CONVERSION FACTOR ; LOW-METALLICITY ; NEARBY GALAXIES ; FORMATION LAW ; DUST ; GAS ; EMISSION ; ABUNDANCES ; SCALES ; MODEL |
| 收录类别 | SCI |
| 原文出处 | 10.1038/nature13820 |
| 语种 | 英语 |
| WOS记录号 | WOS:000342988600044 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10689]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.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 |
| 推荐引用方式 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-+. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。