Universität zu Köln

Neufeld, David A., Black, John H., Gerin, Maryvonne ORCID: 0000-0002-2418-7952, Goicoechea, Javier R. ORCID: 0000-0001-7046-4319, Goldsmith, Paul F., Gry, Cecile ORCID: 0000-0003-0788-7452, Gupta, Harshal, Herbst, Eric, Indriolo, Nick ORCID: 0000-0001-8533-6440, Lis, Dariusz, Menten, Karl M., Monje, Raquel, Mookerjea, Bhaswati, Persson, Carina, Schilke, Peter ORCID: 0000-0003-2141-5689, Sonnentrucker, Paule and Wolfire, Mark G. (2015). HERSCHEL OBSERVATIONS OF INTERSTELLAR CHLORONIUM. II. DETECTIONS TOWARD G29.96-0.02, W49N, W51, AND W3(OH), AND DETERMINATIONS OF THE ORTHO-TO-PARA AND (CI)-C-35/(CI)-C-37 ISOTOPIC. Astrophys. J., 807 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We report additional detections of the chloronium molecular ion, H2Cl+, toward four bright submillimeter continuum sources: G29.96-0.02, W49N, W51, and W3(OH). With the use of the HIFI instrument on board the Herschel Space Observatory, we observed the 2(12)-1(01) transition of ortho-(H2Cl+)-Cl-35 at 781.627 GHz in absorption toward all four sources. Much of the detected absorption arises in diffuse foreground clouds that are unassociated with the background continuum sources and in which our best estimates of the N(H2Cl+)/N(H) ratio lie in the range (0.9-4.8) x 10(-9). These chloronium abundances relative to atomic hydrogen can exceed the predictions of current astrochemical models by up to a factor of 5. Toward W49N, we have also detected the 2(12)-1(01) transition of ortho-(H2Cl+)-Cl-37 at 780.053 GHz and the 1(11)-1(00) transition of para-(H2Cl+)-Cl-35 at 485.418 GHz. These observations imply (H2Cl+)-Cl-35/ (H2Cl+)-Cl-37 column density ratios that are consistent with the solar system Cl-35/Cl-37 isotopic ratio of 3.1, and chloronium ortho-to-para ratios consistent with 3, the ratio of spin statistical weights.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Neufeld, David A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Black, John H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerin, Maryvonne UNSPECIFIED orcid.org/0000-0002-2418-7952 UNSPECIFIED Goicoechea, Javier R. UNSPECIFIED orcid.org/0000-0001-7046-4319 UNSPECIFIED Goldsmith, Paul F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gry, Cecile UNSPECIFIED orcid.org/0000-0003-0788-7452 UNSPECIFIED Gupta, Harshal UNSPECIFIED UNSPECIFIED UNSPECIFIED Herbst, Eric UNSPECIFIED UNSPECIFIED UNSPECIFIED Indriolo, Nick UNSPECIFIED orcid.org/0000-0001-8533-6440 UNSPECIFIED Lis, Dariusz UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, Karl M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Monje, Raquel UNSPECIFIED UNSPECIFIED UNSPECIFIED Mookerjea, Bhaswati UNSPECIFIED UNSPECIFIED UNSPECIFIED Persson, Carina UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, Peter UNSPECIFIED orcid.org/0000-0003-2141-5689 UNSPECIFIED Sonnentrucker, Paule UNSPECIFIED UNSPECIFIED UNSPECIFIED Wolfire, Mark G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-399411
DOI:	10.1088/0004-637X/807/1/54
Journal or Publication Title:	Astrophys. J.
Volume:	807
Number:	1
Date:	2015
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PARA RATIO; HYDROGEN-CHLORIDE; MOLECULAR CLOUDS; GALAXY; H2CL+; WATER; HIFI; H2O+; GAS; ABSORPTION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/39941