H-2 cooling of primordial gas triggered by UV irradiation

被引：145

作者：

Haiman, Z ^{[1
]}

Rees, MJ ^{[1
]}

Loeb, A ^{[1
]}

机构：

[1] UNIV CAMBRIDGE, INST ASTRON, CAMBRIDGE CB3 1RZ, ENGLAND

来源：

ASTROPHYSICAL JOURNAL | 1996年 / 467卷 / 02期

关键词：

cosmology; theory; galaxies; formation; molecular processes; radiative transfer;

D O I：

10.1086/177628

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the formation of molecular hydrogen (H-2) in a primordial H + He gas cloud irradiated by a power-law UV flux. We find that at high densities (greater than or similar to 1 cm(-3)) and low temperatures(less than or similar to 10(4) K), the background radiation enhances the formation of H-2 and results in molecular cooling dominating over photoionization heating. This process could accelerate the collapse and fragmentation of dense objects at high redshifts.

引用

页码：522 / 531

页数：10

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