The evolution of the effective equation of state of the intergalactic medium

被引：219

作者：

Ricotti, M ^{[1
]}

Gnedin, NY ^{[1
]}

Shull, JM ^{[1
]}

机构：

[1] Univ Colorado, Ctr Astrophys & Space Astron, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 534卷 / 01期

关键词：

cosmology : theory; equation of state; intergalactic medium; quasars : absorption lines;

D O I：

10.1086/308733

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We develop a method to extract the "effective equation of state" of the intergalactic medium from the Doppler (b) parameter distribution of the low-density Ly alpha forest. We test the method on numerical simulations and then apply it to published observations of the Ly alpha forest at redshifts z similar or equal to 0-4. We find that the effective equation of state is close to isothermal at redshift z similar to 3, indicating that a second reheating of the intergalactic medium took place at z similar to 3. This reheating can plausibly be identified with the reionization of He II observed to occur at z similar to 3.

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收藏

页码：41 / 56

页数：16

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