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Parsec scale CO depletion in KAGONMA 71, or a star-forming filament in CMa OB1

Published online by Cambridge University Press:  09 June 2023

T. Handa Open the ORCID record for T. Handa [Opens in a new window] ,
Y. Hirata ,
T. Murase Open the ORCID record for T. Murase [Opens in a new window] ,
J. Nishi ,
Y. Shimajiri ,
T. Omodaka ,
M. Nakano ,
K. Sunada ,
T. Ito  and
J. O. Chibueze Open the ORCID record for J. O. Chibueze [Opens in a new window]
T. Handa
Affiliation:
Amanogawa Galaxy Astronomy Research Center, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: handa@sci.kagoshima-u.ac.jp Faculty of Science, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Y. Hirata
Affiliation:
Faculty of Science, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan
T. Murase
Affiliation:
Faculty of Science, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan
J. Nishi
Affiliation:
Faculty of Science, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Y. Shimajiri
Affiliation:
ALMA project, National Astron. Obs. Japan, 1-21-3 Osawa, Mitaka 181-8588, Japan
T. Omodaka
Affiliation:
Faculty of Science, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan
M. Nakano
Affiliation:
Faculty of Education, Oita University, 700 Dannoharu, Oita 870-1192, Japan
K. Sunada
Affiliation:
Mizusawa VLBI Obs., National Astron. Obs. Japan, Hoshigamine, Oshu-shi 2531, Japan
T. Ito
Affiliation:
Amanogawa Galaxy Astronomy Research Center, Kagoshima Univ., 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: handa@sci.kagoshima-u.ac.jp Kuamoto Univ. Kumamoto, Japan
J. O. Chibueze
Affiliation:
Centre for Space Research, North-West Univ., Potchefstroom 2531, South Africa Department of Phys. and Astron., Faculty of Physical Sci., Univ. of Nigeria, Carver Building, University road, Nsukka 410001, Nigeria
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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.

Keywords

ISM: abundancesISM: cloudsISM: molecules
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies (Aug 2022) , August 2021 , pp. 31 - 34
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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