Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey
Abstract
We present the results of on-the-fly mapping observations of 44 fields containing 107 SCUBA-2 cores in the emission lines of molecules, NH, HCN, and CCS at 8294 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 NH and HCN line emissions are approximately similar to that of 850-m 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-m dust continuum emission. Occasionally (12%), we observe the 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 nonthermal velocity dispersion.
Keywords
Cite
@article{arxiv.2106.04052,
title = {Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey},
author = {Ken'ichi Tatematsu and Gwanjeong Kim and Tie Liu and Neal J. Evans and Hee-Weon Yi and Jeong-Eun Lee and Yuefang Wu and Naomi Hirano and Sheng-Yuan Liu and Somnath Dutta and Dipen Sahu and Patricio Sanhueza and Kee-Tae Kim and Mika Juvela and L. Viktor T'oth and Orsolya Feh'er and Jinhua He and J. X. Ge and Siyi Feng and Minho Choi and Miju Kang and Mark A. Thompson and Gary A. Fuller and Di Li and Isabelle Ristorcelli and Ke Wang and James Di Francesco and David Eden and Satoshi Ohashi and Ryo Kandori and Charlotte Vastel and Tomoya Hirota and Takeshi Sakai and Xing Lu and Quang Nguyen Lu'o'ng and Hiroko Shinnaga and Jungha Kim and JCMT Large Program "SCOPE'' collaboration},
journal= {arXiv preprint arXiv:2106.04052},
year = {2022}
}
Comments
45 pages, 15 figures, ApJS, in press