Discovery of two metallic cyanoacetylides in IRC +10216: HMgCCCN and NaCCCN

C. Cabezas*, J. R. Pardo, M. Agúndez, B. Tercero, N. Marcelino, Y. Endo, P. De Vicente, M. Guélin, J. Cernicharo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish
Article numberL12
JournalAstronomy and Astrophysics
StatePublished - 1 Apr 2023


  • Astrochemistry
  • ISM: individual objects: IRC +10216
  • ISM: molecules
  • Line: identification
  • Molecular data


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