Universität zu Köln

Mueller, Holger S. P., Goicoechea, Javier R. ORCID: 0000-0001-7046-4319, Cernicharo, Jose ORCID: 0000-0002-3518-2524, Agundez, Marcelino ORCID: 0000-0003-3248-3564, Pety, Jerome, Cuadrado, Sara ORCID: 0000-0002-7393-1813, Gerin, Maryvonne, Dumas, Gaelle and Chapillon, Edwige (2014). Revised spectroscopic parameters of SH+ from ALMA and IRAM 30m observations. Astron. Astrophys., 569. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Hydrides represent the first steps of interstellar chemistry. Sulfanylium (SH+), in particular, is a key tracer of energetic processes. We used ALMA and the IRAM 30m telescope to search for the lowest frequency rotational lines of SH+ toward the Orion Bar, the prototypical photo-dissociation region illuminated by a strong UV radiation field. On the basis of previous Herschel/HIFI observations of SH+, we expected to detect emission of the two SH+ hyperfine structure (HFS) components of the N-J = 1(0)-0(1) fine structure (FS) component near 346 GHz. While we did not observe any lines at the frequencies predicted from laboratory data, we detected two emission lines, each similar to 15MHz above the SH+ predictions and with relative intensities and HFS splitting expected for SH+. The rest frequencies of the two newly detected lines are more compatible with the remainder of the SH+ laboratory data than the single line measured in the laboratory near 346 GHz and previously attributed to SH+. Therefore, we assign these new features to the two SH+ HFS components of the N-J = 1(0)-0(1) FS component and re-determine its spectroscopic parameters, which will be useful for future observations of SH+, in particular if its lowest frequency FS components are studied. Our observations demonstrate the suitability of these lines for SH+ searches at frequencies easily accessible from the ground.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goicoechea, Javier R. UNSPECIFIED orcid.org/0000-0001-7046-4319 UNSPECIFIED Cernicharo, Jose UNSPECIFIED orcid.org/0000-0002-3518-2524 UNSPECIFIED Agundez, Marcelino UNSPECIFIED orcid.org/0000-0003-3248-3564 UNSPECIFIED Pety, Jerome UNSPECIFIED UNSPECIFIED UNSPECIFIED Cuadrado, Sara UNSPECIFIED orcid.org/0000-0002-7393-1813 UNSPECIFIED Gerin, Maryvonne UNSPECIFIED UNSPECIFIED UNSPECIFIED Dumas, Gaelle UNSPECIFIED UNSPECIFIED UNSPECIFIED Chapillon, Edwige UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-429564
DOI:	10.1051/0004-6361/201424756
Journal or Publication Title:	Astron. Astrophys.
Volume:	569
Date:	2014
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORION BAR; ROTATIONAL SPECTRUM; MOLECULAR-SPECTROSCOPY; INTERSTELLAR-MEDIUM; COLOGNE DATABASE; SUBMILLIMETER; CHEMISTRY; WARM; HCO+; GAS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42956