| Issue |
A&A
Volume 672, April 2023
|
|
|---|---|---|
| Article Number | L12 | |
| Number of page(s) | 6 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202346462 | |
| Published online | 21 April 2023 | |
Letter to the Editor
Discovery of two metallic cyanoacetylides in IRC +10216: HMgCCCN and NaCCCN⋆
1
Departamento de Astrofísica Molecular, Instituto de Física Fundamental (IFF-CSIC), C/ Serrano 121, 28006 Madrid, Spain
e-mail: carlos.cabezas@csic.es; jose.cernicharo@csic.es
2
Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain
3
Observatorio Astronómico Nacional (OAN, IGN), Madrid, Spain
4
Department of Applied Chemistry, Science Building II, National Yang Ming Chiao Tung University, 1001 Ta-Hsueh Rd., Hsinchu 300098, Taiwan
5
Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, 38406 Saint Martin d’Hères, France
Received:
20
March
2023
Accepted:
3
April
2023
We report on the detection of a series of six lines in the ultra-deep Q-band integration towards IRC +10216 carried out with the Yebes 40 m telescope, which are in harmonic relation with integer quantum numbers Ju from 12 to 18. After a detailed analysis of all possible carriers, guided by high-level quantum chemical calculations, we conclude that the lines belong to HMgCCCN, named hydridomagnesium cyanoacetylide. The rotational temperature and column density derived for HMgCCCN are 17.1 ± 2.8 K and (3.0 ± 0.6) × 1012 cm−2, respectively. The observed abundance ratio between MgCCCN and HMgCCCN is approximately three. In addition, we report the discovery in space, also towards IRC +10216, of sodium cyanoacetylide, NaCCCN, for which accurate laboratory data are available. For this species we derived a rotational temperature of 13.5 ± 1.7 K and a column density of (1.2 ± 0.2) × 1011 cm−2.
Key words: molecular data / line: identification / ISM: molecules / ISM: individual objects: IRC +10216 / astrochemistry
© The Authors 2023
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