TY - JOUR
T1 - Molecular Cloud Cores with High Deuterium Fractions
T2 - Nobeyama Mapping Survey
AU - JCMT Large Program "SCOPE" collaboration
AU - Tatematsu, Ken'ichi
AU - Kim, Gwanjeong
AU - Liu, Tie
AU - II, Neal J. Evans
AU - Yi, Hee-Weon
AU - Lee, Jeong-Eun
AU - Wu, Yuefang
AU - Hirano, Naomi
AU - Liu, Sheng-Yuan
AU - Dutta, Somnath
AU - Sahu, Dipen
AU - Sanhueza, Patricio
AU - Kim, Kee-Tae
AU - Juvela, Mika
AU - Tóth, L. Viktor
AU - Fehér, Orsolya
AU - He, Jinhua
AU - Ge, Jixing
AU - Feng, Siyi
AU - Choi, Minho
AU - Kang, Miju
AU - Thompson, Mark A
AU - Fuller, Gary A.
AU - Li, Di
AU - Ristorcelli, Isabelle
AU - Wang, Ke
AU - Di Francesco, James
AU - Eden, David
AU - Ohashi, Satoshi
AU - Kandori, Ryo
AU - Vastel, Charlotte
AU - Hirota, Tomoya
AU - Sakai, Takeshi
AU - Lu, Xing
AU - Lu'o'ng, Quang Nguyên
AU - Shinnaga, Hiroko
AU - Kim, Jungha
PY - 2021/6/8
Y1 - 2021/6/8
N2 - 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.
AB - 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.
U2 - 10.3847/1538-4365/ac0978
DO - 10.3847/1538-4365/ac0978
M3 - Article
SN - 0067-0049
VL - 256
JO - The Astrophysical Journal Supplement Series
JF - The Astrophysical Journal Supplement Series
IS - 2
ER -