2016
DOI: 10.3847/0004-637x/824/2/136
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TMRT OBSERVATIONS OF CARBON-CHAIN MOLECULES IN SERPENS SOUTH 1a

Abstract: We report Shanghai Tian Ma Radio Telescope detections of several long carbonchain molecules at C and Ku band, including HC 3 N, HC 5 N, HC 7 N, HC 9 N, C 3 S, C 6 H and C 8 H toward the starless cloud Serpens South 1a. We detected some transitions (HC 9 N J=13-12 F=12-11 and F=14-13, H 13 CCCN J=2-1 F=1-0 and F=1-1, HC 13 CCN J=2-1 F=2-2, F=1-0 and F=1-1, HCC 13 CN J=2-1 F=1-0 and F=1-1) and resolved some hyperfine components (HC 5 N J=6-5 F=5-4, H 13 CCCN J=2-1 F=2-1) for the first time in the interstellar me… Show more

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Cited by 39 publications
(44 citation statements)
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“…Regarding the abundance ratio of a source previously detected with the TMRT, Serpens South 1a (Li et al 2016), the x(HC 3 N)/x(HC 5 N) and x(HC 5 N)/x(HC 7 N) ratios are 6.5 and 2.0 respectively, and 4.3 on the average, which is close to those of the Lup I starless cores. The ratio of x(C 3 S)/x(HC 7 N) is 1.0 which is larger than those of all the Lup I cores.…”
Section: Lupus I Starless Dust Coressupporting
confidence: 57%
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“…Regarding the abundance ratio of a source previously detected with the TMRT, Serpens South 1a (Li et al 2016), the x(HC 3 N)/x(HC 5 N) and x(HC 5 N)/x(HC 7 N) ratios are 6.5 and 2.0 respectively, and 4.3 on the average, which is close to those of the Lup I starless cores. The ratio of x(C 3 S)/x(HC 7 N) is 1.0 which is larger than those of all the Lup I cores.…”
Section: Lupus I Starless Dust Coressupporting
confidence: 57%
“…The observations were carried out with the Tian Ma Radio Telescope (TMRT) of the Shanghai Observatory. The TMRT is a newly built 65-m diameter fully steerable radio telescope located in the western outskirts of Shanghai (Li et al 2016). The pointing accuracy is better than 10 , and the main beam efficiency is 0.60 in the 12-18 GHz band (Wang et al 2015b;Li et al 2016).…”
Section: Observationmentioning
confidence: 99%
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“…This kind of anomaly, known as isotopic fractionation, has been reported and studied, not only in HC3N but also in HC5N and other carbon-chain molecules, in several hot and cold sources (e.g. Takano et al 1998;Sakai et al 2007Sakai et al , 2013Li et al 2016;Araki et al 2016;Taniguchi et al 2016aTaniguchi et al ,b, 2017. The relative abundances ratios of the 13 C isotopologues can be also calculated using column densities estimated from the most conspicuous transitions assuming LTE conditions (see Table 2).…”
Section: Isotopic Fractionation and Astrochemical Implicationsmentioning
confidence: 92%
“…All these cores in the molecular complex Taurus are in an early stage of CCM chemistry. Meanwhile a number of starless cores outside of Taurus, such as L492, Lupus-1A, L1512, and Serpens South 1a (Serp S1a), have been found to be abundant carbon-chain-producing regions (Hirota & Yamamoto 2006;Sakai et al 2010b;Cordiner et al 2011;Friesen et al 2013;Li et al 2016). Starless and dark cores CB 130-3 in the Aquila rift region and L673-SMM4 in Cloud B of L673 were also identified as carbon-chain-producing regions (Hirota et al 2011).…”
Section: Introductionmentioning
confidence: 99%