Molecular hydrogen in high redshift Damped Lyman-α systems

被引：0
|
作者：
Petitjean, P [1 ]
机构：
[1] Inst Astrophys, F-75014 Paris, France
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2002年 / 281卷 / 1-2期
关键词：
observational cosmology; quasars; absorption lines; molecular hydrogen;
D O I：
10.1023/A:1019557027902
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
I describe briefly the status of an ongoing mini-survey for molecular hydrogen in high-redshift Damped Lyman-alpha systems using UVES at the VLT. H-2 is detected in about 30% of the cases. When H2 is not detected the molecular fraction f = 2N(H-2)/(2N(H-2)+N(HI) is smaller than 10(-)5. Therefore, most of the DLA systems arise in warm (T > 3000 K) and diffuse neutral gas embedded in a strong UV flux. The very recent detection of HD molecules in a Damped Lyman-alpha system at z(a)bs = 2.337 demonstrates the possibility to discuss the high redshift chemistry.
引用
收藏
页码：467 / 470
页数：4
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