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

Abstract

We report on the detection of a series of six lines in the ultra-deep Q-band integration toward IRC+10216 carried out with the Yebes 40m telescope, which are in harmonic relation with integer quantum numbers J 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 hydromagnesium cyanoacetylide. The rotational temperature and column density derived for HMgCCCN are 17.1 +/- 2.8K and (3.0 +/- 0.6) e12 cm-2, respectively. The observed abundance ratio between MgCCCN and HMgCCCN is 3. In addition, we report the discovery in space, also toward IRC+10216, of sodium cyanoacetylide, NaCCCN, for which accurate laboratory data are available. For this species we derive a rotational temperature of 13.5 +/- 1.7K and a column density of (1.2 +/- 0.2) e11 cm-2.

Accepted in Astronomy & Astrophysics as Letter to the Editor on April 3rd, 2023

References in corpus (16)

• Discovery of benzyne, o-C6H4, in TMC-1 with the QUIJOTE line survey
• New molecules in IRC+10216: confirmation of C${}_5$S and tentative identification of MgCCH, NCCP, and SiH${}_3$CN
• Yebes 40 m radio telescope and the broad band NANOCOSMOS receivers at 7 mm and 3 mm for line surveys
• TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S
• Molecular shells in IRC+10216: tracing the mass loss history
• Discovery of HC4NC in TMC-1: A study of the isomers of HC3N, HC5N, and HC7N
• Discovery of fulvenallene in TMC-1 with the QUIJOTE line survey
• Interstellar nitrile anions: Detection of C3N- and C5N- in TMC-1
• Discovery of Time Variation of the Intensity of Molecular Lines in IRC+10216 in The Submillimeter and Far Infrared Domains
• Discovery of the C7N- anion in TMC-1 and IRC+10216
• Magnesium radicals MgC${}_5$N and MgC${}_6$H in IRC+10216
• Orion Source I's disk is salty
• Discovery of the first Ca-bearing molecule in space: CaNC
• Laboratory and astronomical discovery of magnesium dicarbide, MgC${}_2$
• Helios 2 observations of solar wind turbulence decay in the inner heliosphere
• Clues to NaCN formation

Cited by in corpus (5)

• Carbon-Chain Chemistry in the Interstellar Medium
• The magnesium paradigm in IRC+10216: Discovery of MgC${}_4$H${}^{+}$, MgC${}_3$N${}^{+}$, MgC${}_6$H${}^{+}$, and MgC${}_5$N${}^{+}$
• Detection of the linear SiC${}_3$ and SiC${}_5$ radicals in IRC\,+10216
• Deep survey of millimeter RRLs towards the planetary nebulae IC 418 and NGC 7027
• Development of a glow-discharge ion-trap instrument for measuring effective radiative-association rate coefficients