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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
ALMA Observations of Vibrationally Excited HC3N Lines Toward Orion KL
Astrophysical Journal, Volume 837, No. 1, Article 49, Year 2017
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Description
We present high spatial resolution ALMA observations of vibrational transitions of HC3N toward Orion KL in the 214-247 GHz frequency band. 41 transitions of HC3N in 7 vibrationally excited states, and 23 transitions of 13C isotopologues of HC3N in 2 vibrational states are detected. The line images show that vibrationally excited HC3N lines originate mainly from the hot core of Orion and IRc7. The images of HC3N vibrationally excited lines show that the line emission peaks associated with the hot core move from south to northeast as increases. Based on multiple transitions of each vibrationally excited state, we performed local thermodynamic equilibrium calculations in the XCLASS suite toward the hot core and IRc7 positions. Generally, transitions in highly excited states have higher rotational temperatures and lower column densities. The rotational temperatures and column densities of the hot core range from 93 to 321 K, and from 1.0 ×1014 to 4.9 ×1016 cm-2, respectively. Lower rotational temperatures ranging from 88 to 186 K and column densities from 1.0 ×1014 to 3.2 ×1016 cm-2 are obtained toward IRc7. The facts that the hot core emission peaks of vibrationally excited HC3N lines move from south to northeast with increasing , and that higher-energy HC3N lines have higher rotational temperatures and lower column densities, appear to support that the hot core is externally heated. The emission peaks are moving along the major axis of the SiO outflow, which may indicate that higher-energy HC3N transitions are excited by interaction between pre-existing dense medium and shocks generated by SiO outflows. © 2017. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Peng, Yaping
China, Kunming
Yunnan University
Qin, Shengli
China, Kunming
Yunnan University
Schilke, Peter
Germany, Koln
Universität zu Köln
Wu, Yuefang
China, Beijing
Peking University
Liu, Tie
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Li, D. H.
China, Beijing
Chinese Academy of Sciences
Liu, Shengyuan
Taiwan, Nankang
Academia Sinica Taiwan
Feng, Siyi
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Luo, Gan
China, Beijing
Chinese Academy of Sciences
Statistics
Citations: 16
Authors: 9
Affiliations: 8
Identifiers
Doi:
10.3847/1538-4357/aa5c81
ISSN:
0004637X
Research Areas
Environmental