Properties of the thinnest cold HI clouds in the diffuse interstellar medium

被引：0
|
作者：
Stanimirovic, Snezana [1 ,2 ]
Heiles, Carl [3 ]
Kanekar, Nissim [4 ]
机构：
[1] Univ Wisconsin, Dept Astron, 475 N Charter St, Madison, WI 53706 USA
[2] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA
[4] Natl Radio Astron Observ, Socorro, NM 87801 USA
来源：
SINS - SMALL IONIZED AND NEUTRAL STRUCTURES IN THE DIFFUSE INTERSTELLAR MEDIUM | 2007年 / 365卷
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have obtained deep HI observations in the direction of 22 continuum sources without previously detected cold neutral medium (CNM). IS CNM clouds were detected with a typical HI column density of 3 x 1018 CM-2. Our surprisingly high detection rate suggests that clouds with low HI column densities are quite common in the interstellar medium. These clouds appear to represent an extension of the traditional CNM cloud population, yet have sizes in hundreds to thousands of AUs. We present properties'of the newlydetected CNM sample, and discuss several theoretical avenues important for understanding the production mechanisms of these clouds.
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页码：22 / +
页数：2
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