HYDROGEN CHLORIDE IN DIFFUSE INTERSTELLAR CLOUDS ALONG THE LINE OF SIGHT TO W31C (G10.6-0.4)
HYDROGEN CHLORIDE IN DIFFUSE INTERSTELLAR CLOUDS ALONG THE LINE OF SIGHT TO W31C (G10.6-0.4)
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沿着 W31C 视线的弥漫星际云中的氯化氢 (G10.6-0.4)
DOI：
10.1088/0004-637x/767/1/81
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
T. Phillips
中科院分区：
文献类型：
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作者：
R. Monje;D. Lis;È. Roueff;M. Gerin;M. D. Luca;D. Neufeld;B. Godard;T. Phillips
我们报告了在恒星形成区W31 C（G10.6-0.4）的视线上，在弥漫的分子云中探测到氯化氢（HCl）。用Herschel空间天文台的远红外外差仪（HIFI）的1b接收器观测了两种稳定的HCl同位素H35 Cl和H37 Cl的J = 1-0线。HCl线被检测到的吸收，在一个广泛的速度范围内与扩散云沿着视线到W31 C。对吸收强度的分析得出总HCl柱密度为1013 cm−2，这意味着HCl占气相氯总量的10.6%，超过理论模型预测的10.6%。这一结果与化学相关物质H2 Cl+和HCl+的结果相当，后者在同一视线上也报告了大柱密度。模型和观测之间的差异的来源仍然是未知的，但是，这些含氯分子的检测提供了扩散气体中的氯化学的关键约束。
We report the detection of hydrogen chloride, HCl, in diffuse molecular clouds on the line of sight toward the star-forming region W31C (G10.6-0.4). The J = 1–0 lines of the two stable HCl isotopologues, H35Cl and H37Cl, are observed using the 1b receiver of the Heterodyne Instrument for the Far-Infrared (HIFI) on board the Herschel Space Observatory. The HCl line is detected in absorption, over a wide range of velocities associated with diffuse clouds along the line of sight to W31C. The analysis of the absorption strength yields a total HCl column density of a few 1013 cm−2, implying that HCl accounts for ∼0.6% of the total gas-phase chlorine, which exceeds the theoretical model predictions by a factor of ∼6. This result is comparable to those obtained from the chemically related species H2Cl+ and HCl+, for which large column densities have also been reported on the same line of sight. The source of discrepancy between models and observations is still unknown; however, the detection of these Cl-bearing molecules provides key constraints for the chlorine chemistry in the diffuse gas.