1990
DOI: 10.1086/185816
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Detection of five C-13 isotopic species of HC5N in TMC-1

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Cited by 46 publications
(98 citation statements)
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“…In TMC-1, the rotational temperature of various carbon-chain molecules ranges mostly from 4 to 8 K, which is lower than the gas kinetic temperature of 10 K (e.g., Kawaguchi et al 1991;Kalenskii et al 2004;Takano et al 1990). This means that the density of the emitting region is not high enough to thermalize the rotational level population to the gas kinetic temperature for most cases.…”
Section: High-excitation Lines Of Carbon-chain Moleculesmentioning
confidence: 94%
“…In TMC-1, the rotational temperature of various carbon-chain molecules ranges mostly from 4 to 8 K, which is lower than the gas kinetic temperature of 10 K (e.g., Kawaguchi et al 1991;Kalenskii et al 2004;Takano et al 1990). This means that the density of the emitting region is not high enough to thermalize the rotational level population to the gas kinetic temperature for most cases.…”
Section: High-excitation Lines Of Carbon-chain Moleculesmentioning
confidence: 94%
“…Takano et al (1998) CN] ratio to be 79 ± 11, 75 ± 10, and 55 ± 7 (1σ), respectively. Takano et al (1990) derived the 12 C/ 13 C ratios for the five 13 C species of HC 5 N to be 79-103. Recently, Langston & Turner (2007) However, the dilution has not been discussed seriously, although Sakai et al (2007a) considered an effect of the isotope selective photodissociation for the 13 CCS case.…”
Section: C Dilution In Cchmentioning
confidence: 99%
“…In the same year Avery et al (1976) reported the first interstellar detection of this carbon chain in the molecular cloud Sgr B2, where the 10.65 GHz line was observed. Since that time, the number of new HC 5 N sources and interstellar transitions has increased regularly, leading to the detection of emission lines also in the millimeter-wave (mm-wave) region (Winnewisser & Walmsley 1979), for the deuterated species (MacLeod et al 1981), and for the 13 C-containing isotopomers (Takano et al 1990). The study of the ground-state rotational spectrum of HC 5 N was extended to the mm-wave region by Winnewisser et al (1982), and then to the submm-wave region by Bizzocchi et al (2004).…”
Section: Introductionmentioning
confidence: 99%