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Molecular cloud cores with high deuterium fractions: nobeyama mapping survey
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Molecular cloud cores with high deuterium fractions: nobeyama mapping survey

Ken'ichi Tatematsu, Gwanjeong Kim, Tie Liu, Neal J. Evans II, Hee-Weon Yi, Jeong-Eun Lee, Yuefang Wu, Naomi Hirano, Sheng-Yuan Liu, Somnath Dutta, …
Astrophysical Journal, Supplement Series, 卷.256(2), A1
10/2021
DOI: https://doi.org/10.3847/1538-4365/ac0978

摘要

Astronomy and Astrophysics Space and Planetary Science
We present the results of on-the-fly mapping observations of 44 fields containing 107 SCUBA-2 cores in the emission lines of molecules N2H+, HC3N, and CCS at 82-94 GHz using the Nobeyama 45 m telescope. This study aimed at investigating the physical properties of cores that show high deuterium fractions and might be close to the onset of star formation. We found that the distributions of the N2H+ and HC3N line emissions are approximately similar to the distribution of the 850 µm dust continuum emission, whereas the CCS line emission is often undetected or is distributed in a clumpy structure surrounding the peak position of the 850 µm dust continuum emission. Occasionally (12%), we observe CCS emission, which is an early-type gas tracer toward the young stellar object, probably due to local high excitation. Evolution toward star formation does not immediately affect the nonthermal velocity dispersion.

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