Carbon-Chain Molecules in Molecular Outflows and Lupus I Region–New Producing Region and New Forming Mechanism. (arXiv:1905.10322v1 [astro-ph.SR])

Carbon-Chain Molecules in Molecular Outflows and Lupus I Region–New Producing Region and New Forming Mechanism. (arXiv:1905.10322v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Wu_Y/0/1/0/all/0/1">Yuefang Wu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_X/0/1/0/all/0/1">Xunchuan Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_X/0/1/0/all/0/1">Xi Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lin_L/0/1/0/all/0/1">Lianghao Lin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yuan_J/0/1/0/all/0/1">Jinghua Yuan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_C/0/1/0/all/0/1">Chao Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_T/0/1/0/all/0/1">Tie Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shen_Z/0/1/0/all/0/1">Zhiqiang Shen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_J/0/1/0/all/0/1">Juan Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_J/0/1/0/all/0/1">Junzhi Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Qin_S/0/1/0/all/0/1">Sheng-Li Qin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kim_K/0/1/0/all/0/1">Kee-Tae Kim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_H/0/1/0/all/0/1">Hongli Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhu_L/0/1/0/all/0/1">Lei Zhu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Madones_D/0/1/0/all/0/1">Diego Madones</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Inostroza_N/0/1/0/all/0/1">Natalia Inostroza</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Henkel_C/0/1/0/all/0/1">C. Henkel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_T/0/1/0/all/0/1">Tianwei Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_D/0/1/0/all/0/1">Di Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Esimbek_J/0/1/0/all/0/1">Jarken Esimbek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_Q/0/1/0/all/0/1">Qinghui Liu</a>

Using the new equipment of the Shanghai Tian Ma Radio Telescope, we have
searched for carbon-chain molecules (CCMs) towards five outflow sources and six
Lupus I starless dust cores, including one region known to be characterized by
warm carbon-chain chemistry (WCCC), Lupus I-1 (IRAS 15398-3359), and one TMC-1
like cloud, Lupus I-6 (Lupus-1A). Lines of HC3N J=2-1, HC5N J=6-5, HC7N
J=14-13, 15-14, 16-15 and C3S J=3-2 were detected in all the targets except in
the outflow source L1660 and the starless dust core Lupus I-3/4. The column
densities of nitrogen-bearing species range from 10$^{12}$ to 10$^{14}$
cm$^{-2}$ and those of C$_3$S are about 10$^{12}$ cm$^{-2}$. Two outflow
sources, I20582+7724 and L1221, could be identified as new
carbon-chain–producing regions. Four of the Lupus I dust cores are newly
identified as early quiescent and dark carbon-chain–producing regions similar
to Lup I-6, which together with the WCCC source, Lup I-1, indicate that
carbon-chain-producing regions are popular in Lupus I which can be regard as a
Taurus like molecular cloud complex in our Galaxy. The column densities of C3S
are larger than those of HC7N in the three outflow sources I20582, L1221 and
L1251A. Shocked carbon-chain chemistry (SCCC) is proposed to explain the
abnormal high abundances of C3S compared with those of nitrogen-bearing CCMs.
Gas-grain chemical models support the idea that shocks can fuel the environment
of those sources with enough $S^+$ thus driving the generation of S-bearing
CCMs.

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