期刊
ASTROPHYSICAL JOURNAL
卷 736, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/736/1/4
关键词
ISM: abundances; ISM: individual objects (CB130-3, L673-SMM4); ISM: molecules; radio lines: ISM
资金
- Inoue Foundation for Science
- Ministry of Education, Culture, Sports, Science and Technology of Japan [21224002, 21740132]
- Grants-in-Aid for Scientific Research [21224002, 21740132] Funding Source: KAKEN
We have found two dense cores, CB130-3 and L673-SMM4, where the carbon-chain molecules are extremely abundant relative to NH3, during a survey observation of radio emission lines of CCS, HC3N, HC5N, and NH3 toward dark cloud cores. Judging from the low NH3/CCS ratios, they are possible candidates for Carbon-Chain-Producing Regions (CCPRs) recognized as chemically young dark cloud cores. The deuterium fractionation ratios DNC/(HNC)-C-13 in CB130-3 and L673-SMM4 are found to be 1.28(-0.05)(+0.27) and 1.96(-0.01)(+0.32), respectively, which are comparable to or slightly higher than those in CCPRs found previously. We suggest that the dense cores of CB130-3 and L673-SMM4 are analogous to CCPRs, but their chemical evolutionary phase would be slightly older than those of the dense cores in the Taurus region.
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