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Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey

Tatematsu, K, Kim, G, Liu, T, Evans II, NJ, Yi, H-W, Lee, J-E, Wu, Y, Hirano, N, Liu, S-Y, Dutta, S, Sahu, D, Sanhueza, P, Kim, K-T, Juvela, M, Tóth, LV, Fehér, O, He, J, Ge, J, Feng, S, Choi, M , Kang, M, Thompson, MA, Fuller, GA, Li, D, Ristorcelli, I, Wang, K, Di Francesco, J, Eden, DJ, Ohashi, S, Kandori, R, Vastel, C, Hirota, T, Sakai, T, Lu, X, Nguyên Lu’o’ng, Q, Shinnaga, H, Kim, J and “SCOPE” collaboration, JCMTLP (2021) Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey. The Astrophysical Journal Supplement Series, 256 (2). ISSN 0067-0049

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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 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.

Item Type: Article
Additional Information: Ken'ichi Tatematsu et al 2021 ApJS 256 25
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 19 Oct 2021 09:19
Last Modified: 19 Oct 2021 09:30
DOI or Identification number: 10.3847/1538-4365/ac0978
URI: https://researchonline.ljmu.ac.uk/id/eprint/15659

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