In:
The Astrophysical Journal, American Astronomical Society, Vol. 824, No. 2 ( 2016-06-20), p. 136-
Abstract:
We report Shanghai Tian Ma Radio Telescope (TMRT) detections of several long carbon-chain molecules in the C and Ku bands, 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 medium. The column densities of these carbon-chain molecules in the range 10 12 –10 13 cm −2 are comparable to two carbon-chain molecule rich sources, TMC-1 and Lupus-1A. The abundance ratios are 1.00:(1.11 ± 0.15):(1.47 ± 0.18) for [H 13 CCCN]:[HC 13 CCN]:[HCC 13 CN]. This result implies that the 13 C isotope is also concentrated in the carbon atom adjacent to the nitrogen atom in HC 3 N in Serpens South 1a, which is similar to TMC-1. The [HC 3 N]/[H 13 CCCN] ratio of 78 ± 9, the [HC 3 N]/[HC 13 CCN] ratio of 70 ± 8, and the [HC 3 N]/[HCC 13 CN] ratio of 53 ± 4 are also comparable to those in TMC-1. Serpens South 1a proves to be a suitable testing ground for understanding carbon-chain chemistry.
Type of Medium:
Online Resource
ISSN:
0004-637X
,
1538-4357
DOI:
10.3847/0004-637X/824/2/136
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2016
detail.hit.zdb_id:
2960-9
detail.hit.zdb_id:
1473835-1
SSG:
16,12
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