Parsec scale CO depletion in KAGONMA 71, or a star-forming filament in CMa OB1
Abstract
The depletion of CO molecules is observed in infrared dark clouds. However, only few exsamples are found in pc-scale. An NH3 emission is one of good counter parts of C18O because of similar effective critical density. Our NH3 observations of a molecular filament associated with CMa OB1 or KAG 71, which is a target of Kagoshima Galactic Object survey with Nobeyama 45-m telescope by Mapping in Ammonia lines (KAGONMA) project. Although NH3 data shows similarity in morphology with infrared data suggesting no depletion, C18O in the clumps 4 and 6 are weaker than expected based on NH3 data. After examining the dissipation of the high-density gas, photodissociation, and depletion, we concluded that CO is depleted at least in the clump 4. It is a new example of depletion in pc-scale.
- Publication:
-
Resolving the Rise and Fall of Star Formation in Galaxies
- Pub Date:
- 2023
- DOI:
- Bibcode:
- 2023IAUS..373...31H
- Keywords:
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- ISM: abundances;
- ISM: clouds;
- ISM: molecules