期刊
ASTROPHYSICAL JOURNAL
卷 640, 期 2, 页码 553-568出版社
IOP PUBLISHING LTD
DOI: 10.1086/500166
关键词
atomic data; atomic processes; galaxies : formation; molecular data; molecular processes; stars : formation
In primordial gas, molecular hydrogen forms primarily through associative detachment of H(-)and H, thereby destroying the H-. The H- anion can also be destroyed by a number of other reactions, most notably by mutual neutralization with protons. However, neither the associative detachment nor the mutual neutralization rate coefficients are well determined: both may be uncertain by as much as an order of magnitude. This introduces a corresponding uncertainty into the H-2 formation rate, which may have cosmological implications. Here we examine the effect that these uncertainties have on the formation of H-2 and the cooling of protogalactic gas in a variety of situations. We show that the effect is particularly large for protogalaxies forming in previously ionized regions, affecting our predictions of whether or not a given protogalaxy can cool and condense within a Hubble time, and altering the strength of the ultraviolet background that is required to prevent collapse.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据