Is the intercloud medium pervasive
Is the intercloud medium pervasive
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云间媒介是否普及
DOI：
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发表时间：
1980
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影响因子：
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通讯作者：
C. Heiles
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作者：
C. Heiles
我们认为，“不强吸收”（NSA）H I气体，这是星际介质的稳态理论中的intercloud介质的普遍性。我们通过分析附近气体中的宽发射成分和远处气体中吸收成分的缺乏来研究这个问题。我们的结论是，NSA材料是缺乏直接本地太阳附近。在附近区域，它包含38%的星际H I;它通常是普遍存在的，并且经常有内部运动，这大大增加了它的速度色散，超过5 km s/sup-1/最小值。它含有大孔，直径可能高达400 pc，可能占体积的10- 20%。在遥远的区域，NSA物质似乎在8 kpc银河系半径之外无处不在。对于银河系半径在8和10千秒差距之间，它的厚度同意与以前确定的370秒差距附近的地区。在10 kpc之外，厚度急剧增加。在8 kpc内没有数据。
We consider the pervasiveness of the 'not strongly absorbing' (NSA) H I gas, which is the intercloud medium in steady state theories of the interstellar medium. We study the question by analyzing wide emission components in nearby gas, and the absence of absorption components in distant gas. We conclude that the NSA material is deficient in the immediately local solar vicinity. In nearby regions it contains 38% of the interstellar H I; it is generally pervasive and often has internal motions which greatly increase its velocity dispersion above the 5 km s/sup -1/ minimum value. It contains large holes, perhaps ranging up to 400 pc diameter, which probably occupy 10--20% of the volume. In distant regions the NSA material seems to be pervasive outside 8 kpc galactic radius. For galactic radii between 8 and 10 kpc its thickness agrees with previous determinations of 370 pc for nearby regions. Outside 10 kpc the thickness increases dramatically. Inside 8 kpc there are no data.