Universität zu Köln

Vastel, C., Kawaguchi, K., Quenard, D., Ohishi, M., Lefloch, B., Bachiller, R. and Mueller, H. S. P. (2018). High spectral resolution observations of HNC3 and HCCNC in the L1544 pre-stellar core. Mon. Not. Roy. Astron. Soc., 474 (1). S. L76 - 5. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

HCCNC and HNC3 are less commonly found isomers of cyanoacetylene, HC3N, a molecule that is widely found in diverse astronomical sources. We want to know if HNC3 is present in sources other than the dark cloud TMC-1 and how its abundance is relative to that of related molecules. We used the Astrochemical Studies At IRAM unbiased spectral survey at IRAM 30 m towards the prototypical pre-stellar core L1544 to search for HNC3 and HCCNC which are by-product of the HC3NH+ recombination, previously detected in this source. We performed a combined analysis of published HNC3 microwave rest frequencies with thus far unpublished millimetre data because of issues with available rest frequency predictions. We determined new spectroscopic parameters for HNC3, produced new predictions and detected it towards L1544. We used a gas-grain chemical modelling to predict the abundances of N-species and compare with the observations. The modelled abundances are consistent with the observations, considering a late stage of the evolution of the pre-stellar core. However, the calculated abundance of HNC3 was found 5-10 times higher than the observed one. The HC3N, HNC3, and HCCNC versus HC3NH+ ratios are compared in the TMC-1 dark cloud and the L1544 pre-stellar core.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vastel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kawaguchi, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Quenard, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohishi, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lefloch, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bachiller, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, H. S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-196619
DOI:	10.1093/mnrasl/slx197
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	474
Number:	1
Page Range:	S. L76 - 5
Date:	2018
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DISSOCIATIVE RECOMBINATION; NITRILE IONS; MILLIMETER; HC3NH+; HC5N; COLD Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19661