New temperatures of diffuse interstellar gas: Thermally unstable gas

被引：75
作者：
Heiles, C [1 ]
机构：
[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
来源：
ASTROPHYSICAL JOURNAL | 2001年 / 551卷 / 01期
基金：
美国国家科学基金会;
关键词：
ISM : atoms; ISM : general; radio lines : ISM;
D O I：
10.1086/319844
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present new Arecibo 21 cm line measurements of the temperatures of interstellar gas. Our temperatures for the cold neutral medium are significantly lower than previous single-dish results and in very good accord with theoretical models. For warm gas at T>500 K, we find a significant fraction of gas (47%) to lie in the thermally unstable region 500 --> 5000 K; moreover, about 60% of all the neutral atomic gas has T>500 K. Large amounts of thermally unstable gas are not allowed in theoretical models of the global interstellar medium.
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页码：L105 / L108
页数：4
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