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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 HNC18O lines around Sagittarius B2(Sgr B2)with the IRAM 30 m telescope at the 3 mm wavelength.HNCO 404-303 and HOCN 404-303 are...
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| Published in: | 天文和天体物理学研究 2022, Vol.22 (3), p.61-71 |
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| container_end_page | 71 |
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| container_title | 天文和天体物理学研究 |
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| creator | Si-Qi Zheng Juan Li Jun-Zhi Wang Feng Gao Ya-Jun Wu Shu Liu Shang-Huo Li |
| description | 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 HNC18O lines around Sagittarius B2(Sgr B2)with the IRAM 30 m telescope at the 3 mm wavelength.HNCO 404-303 and HOCN 404-303 are used to obtain the abundance ratio of HNCO to HOCN.The ratio of HNCO 404-303 to HNC18O 404-303 is used to calculate the optical depth of HNCO 404-3o3.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 HNC18O lines,we updated the isotopic ratio of 16O/18O to be 296±54 in Sgr B2. |
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| source | Institute of Physics |
| title | Spatial Distribution of HOCN Around Sagittarius B2 |
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