2021A&A...646L...3C -
Astronomy and Astrophysics, volume 646, L3-3 (2021/2-1)
Space and laboratory discovery of HC3S+.
CERNICHARO J., CABEZAS C., ENDO Y., MARCELINO N., AGUNDEZ M., TERCERO B., GALLEGO J.D. and DE VICENTE P.
Abstract (from CDS):
We report the detection in TMC-1 of the protonated form of C3S. The discovery of the cation HC3S+ was carried through the observation of four harmonically related lines in the Q band using the Yebes 40 m radiotelescope, and is supported by accurate ab initio calculations and laboratory measurements of its rotational spectrum. We derive a column density N(HC3S+)=(2.0±0.5)x1011cm–2, which translates to an abundance ratio C3S/HC3S+ of 65±20. This ratio is comparable to the CS/HCS+ ratio (35±8) and is a factor of about ten larger than the C3O/HC3O+ ratio previously found in the same source. However, the abundance ratio HC3O+/HC3S+ is 1.0±0.5, while C3O/C3S is just ∼0.11. We also searched for protonated C2S in TMC-1, based on ab initio calculations of its spectroscopic parameters, and derive a 3σ upper limit of N(HC2S+)≤9x1011cm–2 and a C2S/HC2S+≥60. The observational results are compared with a state-of-the-art gas-phase chemical model and conclude that HC3S+ is mostly formed through several pathways: proton transfer to C3S, reaction of S+ with c-C3H2, and reaction between neutral atomic sulfur and the ion C3H3+ .
Abstract Copyright:
© ESO 2021
Journal keyword(s):
astrochemistry - line: identification - ISM: molecules - ISM: individual objects: TMC-1 - molecular data
Simbad objects:
3
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