Universität zu Köln

Coutens, Audrey ORCID: 0000-0003-1805-3920, Zakharenko, Olena, Lewen, Frank, Jorgensen, Jes K., Schlemmer, Stephan ORCID: 0000-0002-1421-7281 and Mueller, Holger S. P. (2019). Laboratory spectroscopic study of the N-15 isotopomers of cyanamide, H2NCN, and a search for them toward IRAS 16293-2422B. Astron. Astrophys., 623. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Cyanamide is one of the few interstellar molecules containing two chemically different N atoms. It was detected recently toward the solar-type protostar IRAS 16293-2422 B together with (H2NCN)-C-13 and HDNCN in the course of the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS). The detection of the N-15 isotopomers or the determination of upper limits to their column densities was hampered by the lack of accurate laboratory data at the frequencies of the survey. Aims. We wanted to determine spectroscopic parameters of the N-15 isotopomers of cyanamide that are accurate enough for predictions well into the submillimeter region and to search for them in the PILS data. Methods. We investigated the laboratory rotational spectra of H-2(15) NCN and (H2NCN)-N-15 in the selected region between 192 and 507 GHz employing a cyanamide sample in natural isotopic composition. Additionally, we recorded transitions of (H2NCN)-C-13. Results. We obtained new or improved spectroscopic parameters for the three isotopic species. Neither of the N-15 isotopomers of cyanamide were detected unambiguously in the PILS data. Two relatively clean lines can be tentatively assigned to H-2(15) NCN. If confirmed, their column densities would imply a low N-14/N-15 ratio for cyanamide toward this source. Conclusions. The resulting line lists should be accurate enough for observations up to about 1 THz. More sensitive observations, potentially at different frequencies, may eventually lead to the astronomical detection of these isotopic species.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Coutens, Audrey UNSPECIFIED orcid.org/0000-0003-1805-3920 UNSPECIFIED Zakharenko, Olena UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Jorgensen, Jes K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-153979
DOI:	10.1051/0004-6361/201834605
Journal or Publication Title:	Astron. Astrophys.
Volume:	623
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
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 COMPLEX ORGANIC-MOLECULES; ROTATIONAL SPECTRA; LINE SURVEY; SUBMILLIMETER; MILLIMETER Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15397