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:
CreatorsEmailORCIDORCID Put Code
Mueller, Holger S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, Javier R.UNSPECIFIEDorcid.org/0000-0001-7046-4319UNSPECIFIED
Cernicharo, JoseUNSPECIFIEDorcid.org/0000-0002-3518-2524UNSPECIFIED
Agundez, MarcelinoUNSPECIFIEDorcid.org/0000-0003-3248-3564UNSPECIFIED
Pety, JeromeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cuadrado, SaraUNSPECIFIEDorcid.org/0000-0002-7393-1813UNSPECIFIED
Gerin, MaryvonneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dumas, GaelleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chapillon, EdwigeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
ORION BAR; ROTATIONAL SPECTRUM; MOLECULAR-SPECTROSCOPY; INTERSTELLAR-MEDIUM; COLOGNE DATABASE; SUBMILLIMETER; CHEMISTRY; WARM; HCO+; GASMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/42956

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