Galactic H I column densities
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We have determined accurate values of the Galactic neutral hydrogen column density, N_H_, toward 220 quasars and active galactic nuclei from 21cm H I measurements made on the...
我们基于针对[...]开展的21厘米氢原子（H I）射电测量，测定了220颗类星体与活动星系核（Active Galactic Nuclei，AGN）视线方向上的银河中性氢柱密度N_H_的精确数值
