Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey

Ken'Ichi Tatematsu , Gwanjeong Kim , Tie Liu , Neal J. Evans , Hee-Weon Yi , Jeong-Eun Lee , Yuefang Wu , Naomi Hirano , Sheng-Yuan Liu , Somnath Dutta , Dipen Sahu , Patricio Sanhueza , Kee-Tae Kim , Mika Juvela , L. Viktor Tóth , Orsolya Fehér , Jinhua He , Jixing Ge , Siyi Feng , Minho Choi , Miju Kang , Mark A. Thompson , Gary A. Fuller , Di Li , Isabelle Ristorcelli (1) , Ke Wang , James Di Francesco , David Eden , Satoshi Ohashi , Ryo Kandori , Charlotte Vastel (1) , Tomoya Hirota , Takeshi Sakai , Xing Lu , Quang Nguyên Lu'O'Ng (2) , Hiroko Shinnaga , Jungha Kim

1 IRAP - Institut de recherche en astrophysique et planétologie
2 UPCité - Université Paris Cité

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.

Keywords: Interstellar clouds; 834; Astrophysics - Astrophysics of Galaxies

Domains: Sciences of the Universe [physics]

Ken'Ichi Tatematsu, Gwanjeong Kim, Tie Liu, Neal J. Evans, Hee-Weon Yi, et al.. Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey. The Astrophysical Journal Supplement Series, 2021, 256, ⟨10.3847/1538-4365/ac0978⟩. ⟨insu-03672390⟩