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- W4200137777 abstract "Abstract 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." @default.
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- W4200137777 date "2022-02-11" @default.
- W4200137777 modified "2023-09-23" @default.
- W4200137777 title "Spatial Distribution of HOCN Around Sagittarius B2" @default.
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- W4200137777 doi "https://doi.org/10.1088/1674-4527/ac46a2" @default.
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