Magnesium radicals MgC$_5$N and MgC$_6$H in IRC+10216
| Autor: | Belén Tercero, Marcelino Agúndez, M. Guelin, P. de Vicente, Carlos Cabezas, Juan R. Pardo, José Pablo Fonfría, José Cernicharo |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Radical
Line: identification Analytical chemistry FOS: Physical sciences Ionic bonding chemistry.chemical_element Astrophysics 01 natural sciences 0103 physical sciences Radiative transfer Molecule identification [Line] 010303 astronomy & astrophysics Dissociative recombination Stars: individual: IRC+10216 Physics 010304 chemical physics Magnesium Molecular data individual: IRC+10216 [Stars] Astronomy and Astrophysics Circumstellar matter Astrophysics - Astrophysics of Galaxies 3. Good health Stars: carbon chemistry Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) carbon [Stars] |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 5 pags., 3 figs., 2 tabs. 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. We thank Ministerio de Ciencia e Innovación of Spain (MI-CIU) for funding support through projects AYA2016-75066- C2-1-P, PID2019-106110GB-I00, PID2019-107115GB-C21/AEI/10.13039/ 501100011033, and PID2019-106235GB-I00. We also thank ERC for funding through grant ERC-2013-Syg-610256-NANOCOSMOS. M. A. thanks MICIU for grant RyC-2014-162 |
| Databáze: | OpenAIRE |
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