Constraint on intergalactic dust from thermal history of intergalactic medium

被引：22

作者：

Inoue, AK ^{[1
]}

Kamaya, H ^{[1
]}

机构：

[1] Kyoto Univ, Fac Sci, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 341卷 / 03期

关键词：

dust; extinction; intergalactic medium; quasars : absorption lines; cosmology : theory;

D O I：

10.1046/j.1365-8711.2003.06619.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This letter investigates the amount of dust in the intergalactic medium (IGM). The dust photoelectric heating can be the most efficient heating mechanism in the IGM where the density is very small and there are a lot of hard ultraviolet photons. Comparing the observational thermal history of IGM with a theoretical one taking into account the dust photoelectric heating, we can put an upper limit on the dust-to-gas ratio, D, in the IGM. As the rate of the dust photoelectric heating depends on the size of dust, we find the following results: if the grain size is greater than or similar to100 Angstrom, D at z similar to 3 is less than or similar to1/100 Galactic value corresponding to Omega(dust)(IGM)less than or similar to10(-5). On the other hand, if the grain size is as small as similar to10 Angstrom, D is less than or similar to1/1000 Galactic value corresponding to Omega(dust)(IGM)less than or similar to10(-6).

引用

页码：L7 / L11

页数：5

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