Universität zu Köln

Peng, Yaping, Qin, Sheng-Li ORCID: 0000-0003-2302-0613, Schilke, Peter ORCID: 0000-0003-2141-5689, Sanchez-Monge, Alvaro, Wu, Yuefang, Liu, Tie ORCID: 0000-0002-5286-2564, Li, Di ORCID: 0000-0003-3010-7661, Moeller, Thomas, Liu, Sheng-Yuan ORCID: 0000-0003-4603-7119, Feng, Siyi, Liu, Ying, Luo, Gan ORCID: 0000-0002-1583-8514, Zhang, Li and Rong, Jia-Lei (2017). ALMA Observations of Vibrationally Excited HC3N Lines Toward Orion KL. Astrophys. J., 837 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

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 C-13 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 E-u 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 x 10(14) to 4.9 x 10(16) cm(-2), respectively. Lower rotational temperatures ranging from 88 to 186. K and column densities from 1.0 x 10(14) to 3.2 x 10(16) 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 Eu, 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peng, Yaping UNSPECIFIED UNSPECIFIED UNSPECIFIED Qin, Sheng-Li UNSPECIFIED orcid.org/0000-0003-2302-0613 UNSPECIFIED Schilke, Peter UNSPECIFIED orcid.org/0000-0003-2141-5689 UNSPECIFIED Sanchez-Monge, Alvaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Yuefang UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Tie UNSPECIFIED orcid.org/0000-0002-5286-2564 UNSPECIFIED Li, Di UNSPECIFIED orcid.org/0000-0003-3010-7661 UNSPECIFIED Moeller, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Sheng-Yuan UNSPECIFIED orcid.org/0000-0003-4603-7119 UNSPECIFIED Feng, Siyi UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Ying UNSPECIFIED UNSPECIFIED UNSPECIFIED Luo, Gan UNSPECIFIED orcid.org/0000-0002-1583-8514 UNSPECIFIED Zhang, Li UNSPECIFIED UNSPECIFIED UNSPECIFIED Rong, Jia-Lei UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-238770
DOI:	10.3847/1538-4357/aa5c81
Journal or Publication Title:	Astrophys. J.
Volume:	837
Number:	1
Date:	2017
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language C-12/C-13 ISOTOPE RATIO; HOT CORE; MOLECULAR CLOUDS; KINETIC TEMPERATURES; APERTURE SYNTHESIS; MASSIVE STARS; KLEINMANN-LOW; MU-M; MILLIMETER; BN/KL Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23877