Universität zu Köln

Neufeld, David A., Wiesemeyer, Helmut, Wolfire, Mark J., Jacob, Arshia M., Buchbender, Christof ORCID: 0000-0002-2064-7691, Gerin, Maryvonne ORCID: 0000-0002-2418-7952, Gupta, Harshal, Gusten, Rolf and Schilke, Peter (2021). The Chemistry of Chlorine-bearing Species in the Diffuse Interstellar Medium, and New SOFIA/GREAT* Observations of HCl+. Astrophys. J., 917 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We have revisited the chemistry of chlorine-bearing species in the diffuse interstellar medium with new observations of the HCl+ molecular ion and new astrochemical models. Using the GREAT instrument on board SOFIA, we observed the (2)pi(3/2) J = 5/2 - 3/2 transition of HCl+ near 1444 GHz toward the bright THz continuum source W49N. We detected absorption by diffuse foreground gas unassociated with the background source, and were able to thereby measure the distribution of HCl+ along the sight line. We interpreted the observational data using an updated version of an astrochemical model used previously in a theoretical study of Cl-bearing interstellar molecules. The abundance of HCl+ was found to be almost constant relative to the related H2Cl+ ion, but the observed n(H2Cl+)/n(HCl+) abundance ratio exceeds the predictions of our astrochemical model by an order of magnitude. This discrepancy suggests that the rate of the primary destruction process for H2Cl+, dissociative recombination, has been significantly overestimated. For HCl+, the model predictions can provide a satisfactory fit to the observed column densities along the W49N sight line while simultaneously accounting for the OH+ and H2O+ column densities.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Neufeld, David A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiesemeyer, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Wolfire, Mark J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacob, Arshia M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchbender, Christof UNSPECIFIED orcid.org/0000-0002-2064-7691 UNSPECIFIED Gerin, Maryvonne UNSPECIFIED orcid.org/0000-0002-2418-7952 UNSPECIFIED Gupta, Harshal UNSPECIFIED UNSPECIFIED UNSPECIFIED Gusten, Rolf UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-599381
DOI:	10.3847/1538-4357/ac06d3
Journal or Publication Title:	Astrophys. J.
Volume:	917
Number:	2
Date:	2021
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DISSOCIATIVE RECOMBINATION MEASUREMENTS; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; H2CL+ Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59938