Volume 652, August 2021
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||31 August 2021|
Letter to the Editor
Magnesium radicals MgC5N and MgC6H in IRC +10216⋆
Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, C/ Serrano 123, 28006 Madrid, Spain
e-mail: email@example.com, firstname.lastname@example.org
2 Instituto Geográfico Nacional, Centro de Desarrollos Tecnológicos, Observatorio de Yebes, Apartado 148, 19080 Yebes, Spain
3 Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, 38406 St-Martin d’Hères, France
Accepted: 26 July 2021
After the previous discovery of MgC3N and MgC4H in IRC +10216, a deeper Q-band (31.0–50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we assigned on the basis of quantum mechanical calculations to the larger radicals MgC5N and MgC6H. The results presented here extend and confirm previous results on magnesium-bearing molecules in IRC +10216. We derived column densities of (4.7 ± 1.3) × 1012 for MgC5N and (2.0 ± 0.9) × 1013 for MgC6H, which imply that MgC5N/MgC3N = 0.5 and MgC6H/MgC4H = 0.9. Therefore, MgC5N and MgC6H are present with column densities not so different from those of the immediately shorter analogs. The synthesis of these large magnesium cyanides and acetylides in IRC +10216 can be explained for their shorter counterparts by a two-step process initiated by the radiative association of Mg+ with large cyanopolyynes and polyynes, which are still quite abundant in this source, followed by the dissociative recombination of the ionic complexes.
Key words: molecular data / line: identification / stars: carbon / stars: individual: IRC +10216 / circumstellar matter
© ESO 2021
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