Astrophys. J., 767, 81 (2013/April-2)
Hydrogen chloride in diffuse interstellar clouds along the line of sight to W31C (G10.6-0.4).
MONJE R.R., LIS D.C., ROUEFF E., GERIN M., DE LUCA M., NEUFELD D.A., GODARD B. and PHILLIPS T.G.
Abstract (from CDS):
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/cm2, 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.
astrochemistry - ISM: abundances - ISM: molecules - submillimeter: ISM
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