Extremely metal-poor gas at a redshift of 7
In typical astrophysical environments, the abundance of heavy elements ranges from 0.001 to 2 times the solar value. Lower abundances have been seen in selected stars in the Milky Way’s halo(1, 2, 3) and in two quasar absorption systems at redshift z = 3 (ref. 4). These are widely interpreted as rel...
| Main Authors: | , , , , , |
|---|---|
| 其他作者: | |
| 格式: | 文件 |
| 语言: | en_US |
| 出版: |
Nature Publishing Group
2013
|
| 在线阅读: | http://hdl.handle.net/1721.1/79580 https://orcid.org/0000-0003-3769-9559 |