2014A&A...569L...5M


Query : 2014A&A...569L...5M

2014A&A...569L...5M - Astronomy and Astrophysics, volume 569, L5-5 (2014/9-1)

Revised spectroscopic parameters of SH+ from ALMA and IRAM 30m observations.

MUELLER H.S.P., GOICOECHEA J.R., CERNICHARO J., AGUNDEZ M., PETY J., CUADRADO S., GERIN M., DUMAS G. and CHAPILLON E.

Abstract (from CDS):

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 NJ=10-01 fine structure (FS) component near 346GHz. While we did not observe any lines at the frequencies predicted from laboratory data, we detected two emission lines, each ∼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 346GHz and previously attributed to SH+. Therefore, we assign these new features to the two SH+ HFS components of the NJ=10-01 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.

Abstract Copyright:

Journal keyword(s): molecular data - line: identification - ISM: molecules - radio lines: ISM - ISM: individual objects: Orion Bar

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 355 0
2 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 880 0
3 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1105 1
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14549 0
5 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 408 1
6 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 624 0

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