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, 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:
CreatorsEmailORCIDORCID Put Code
Neufeld, David A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Black, John H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, MaryvonneUNSPECIFIEDorcid.org/0000-0002-2418-7952UNSPECIFIED
Goicoechea, Javier R.UNSPECIFIEDorcid.org/0000-0001-7046-4319UNSPECIFIED
Goldsmith, Paul F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gry, CecileUNSPECIFIEDorcid.org/0000-0003-0788-7452UNSPECIFIED
Gupta, HarshalUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbst, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Indriolo, NickUNSPECIFIEDorcid.org/0000-0001-8533-6440UNSPECIFIED
Lis, DariuszUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, Karl M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Monje, RaquelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mookerjea, BhaswatiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, CarinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, PeterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sonnentrucker, PauleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolfire, Mark G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PARA RATIO; HYDROGEN-CHLORIDE; MOLECULAR CLOUDS; GALAXY; H2CL+; WATER; HIFI; H2O+; GAS; ABSORPTIONMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39941

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