Spatial Distribution of HOCN Around Sagittarius B2

HOCN and HNCO abundance ratio in molecular gas can tell us the information of their formation mechanism. We performed high-sensitivity mapping observations of HOCN, HNCO, and HNC 18 O lines around Sagittarius B2 (Sgr B2) with the IRAM 30 m telescope at the 3 mm wavelength. HNCO 4 04 –3 03 and HOCN 4...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2022-03, Vol.22 (3), p.35007
Main Authors: Zheng, Si-Qi, Li, Juan, Wang, Jun-Zhi, Gao, Feng, Wu, Ya-Jun, Liu, Shu, Li, Shang-Huo
Format: Article
Language:English
Subjects:
ISM: abundances
ISM: interstellar clouds
ISM: interstellar molecules
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Summary:HOCN and HNCO abundance ratio in molecular gas can tell us the information of their formation mechanism. We performed high-sensitivity mapping observations of HOCN, HNCO, and HNC 18 O lines around Sagittarius B2 (Sgr B2) with the IRAM 30 m telescope at the 3 mm wavelength. HNCO 4 04 –3 03 and HOCN 4 04 –3 03 are used to obtain the abundance ratio of HNCO to HOCN. The ratio of HNCO 4 04 –3 03 to HNC 18 O 4 04 –3 03 is used to calculate the optical depth of HNCO 4 04 –3 03 . The abundance ratio of HOCN and HNCO is observed to range from 0.4% to 0.7% toward most positions, which agrees well with the gas-grain model. However, the relative abundance of HOCN is observed to be enhanced toward the direction of Sgr B2 (S), with HOCN to HNCO abundance ratio of ∼0.9%. The reason for that still needs further investigation. Based on the intensity ratio of HNCO and HNC 18 O lines, we updated the isotopic ratio of 16 O/ 18 O to be 296 ± 54 in Sgr B2.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/ac46a2