Details

Autor(en) / Beteiligte

• Sanz-Novo, Miguel
• Rivilla, Víctor M
• Jiménez-Serra, Izaskun
• Martín-Pintado, Jesús
• Colzi, Laura
• Zeng, Shaoshan
• Megías, Andrés
• López-Gallifa, Álvaro
• Martínez-Henares, Antonio
• Massalkhi, Sarah
• Tercero, Belén
• de Vicente, Pablo
• David San Andrés
• Martín, Sergio
• Requena-Torres, Miguel A

Titel

Interstellar Detection of O-protonated Carbonyl Sulfide, HOCS

Ist Teil von

• The Astrophysical journal, 2024-04, Vol.965 (2), p.149

Ort / Verlag

Philadelphia: IOP Publishing

Erscheinungsjahr

2024

Link zum Volltext

Quelle

EZB*

Beschreibungen/Notizen

• We present the first detection in space of O-protonated carbonyl sulfide (HOCS+), in the midst of an ultradeep molecular line survey toward the G+0.693-0.027 molecular cloud. From the observation of all Ka = 0 transitions ranging from Jlo = 2 to Jlo = 13 of HOCS+ covered by our survey, we derive a column density of N = (9 ± 2) × 1012 cm−2, translating into a fractional abundance relative to H2 of ∼7 × 10−11. Conversely, the S-protonated HSCO+ isomer remains undetected, and we derive an upper limit to its abundance with respect to H2 of ≤3 × 10−11, a factor of ≥2.3 less abundant than HOCS+. We obtain an HOCS+/OCS ratio of ∼2.5 × 10−3, in good agreement with the prediction of astrochemical models. These models show that one of the main chemical routes to the interstellar formation of HOCS+ is likely the protonation of OCS, which appears to be more efficient at the oxygen end. Also, we find that high values of cosmic-ray ionization rates (10−15–10−14 s−1) are needed to reproduce the observed abundance of HOCS+. In addition, we compare the O/S ratio across different interstellar environments. G+0.693-0.027 appears as the source with the lowest O/S ratio. We find an HOCO+/HOCS+ ratio of ∼31, in accordance with other O/S molecular pairs detected toward this region and also close to the O/S solar value (∼37). This fact indicates that S is not significantly depleted within this cloud due to the action of large-scale shocks, unlike in other sources where S-bearing species remain trapped on icy dust grains.