Query : 2016A&A...591A.126C

2016A&A...591A.126C - Astronomy and Astrophysics, volume 591A, 126-126 (2016/7-1)

Laboratory measurements and astronomical search for the HSO radical.


Abstract (from CDS):

Context. Despite the fact that many sulfur-bearing molecules, ranging from simple diatomic species up to astronomical complex molecules, have been detected in the interstellar medium, the sulfur chemistry in space is largely unknown and a depletion in the abundance of S-containing species has been observed in the cold, dense interstellar medium. The chemical form of the missing sulfur has yet to be identified.
Aims. For these reasons, in view of the fact that there is a large abundance of triatomic species harbouring sulfur, oxygen, and hydrogen, we decided to investigate the HSO radical in the laboratory to try its astronomical detection.
Methods. High-resolution measurements of the rotational spectrum of the HSO radical were carried out within a frequency range well up into the THz region. Subsequently, a rigorous search for HSO in the two most studied high-mass star-forming regions, Orion KL and Sagittarius (Sgr) B2, and in the cold dark cloud Barnard 1 (B1-b) was performed.
Results. The frequency coverage and the spectral resolution of our measurements allowed us to improve and extend the existing dataset of spectroscopic parameters, thus enabling accurate frequency predictions up to the THz range. These were used to derive the synthetic spectrum of HSO, by means of the MADEX code, according to the physical parameters of the astronomical source under consideration. For all sources investigated, the lack of HSO lines above the confusion limit of the data is evident.
Conclusions. The derived upper limit to the abundance of HSO clearly indicates that this molecule does not achieve significant abundances in either the gas phase or in the ice mantles of dust grains.

Abstract Copyright: © ESO, 2016

Journal keyword(s): submillimeter: ISM - line: identification - ISM: molecules - molecular data - methods: laboratory: molecular - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/591/A126): list.dat hsolinel.txt>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 313 0
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 197 0
3 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1291 0
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2228 1
5 [WLQ2014] MM4 cor 05 35 14.35 -05 22 30.9           ~ 9 0
6 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 636 1
7 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2168 1

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