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Paper: Observational Studies of Chemically Young Dark Cloud Cores
Volume: 476, New Trends in Radio Astronomy in the ALMA Era
Page: 325
Authors: Hirota, T.; Suzuki, T.; Ohishi, M.; Sakai, T.; Sakai, N.; Yamamoto, S.
Abstract: We have carried out survey of carbon-chain molecules and NH3 toward more than 100 nearby molecular cloud cores with the Nobeyama 45m telescope. As a result, variations in the NH3/CCS ratios, ranging from 1-500, are found both among dark cloud cores and molecular cloud complexes. It is most likely due to the difference in the contraction timescale and/or the evolutionary phase of the cores. We have identified dark cloud cores with remarkably low NH3/CCS ratios in the Taurus, Aquila, and Cepheus regions. They are possible candidates of chemically and dynamically less evolved cores.
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