J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez, O. Roncero, B. Tercero, N. Marcelino, M. Guélin, Y. Endo, and P. de Vicente
reported on the
The Magnesium Paradigm in IRC +10216: Discovery of MgC4H+, MgC3N+, MgC6H+, and MgC5N+
Astron. Astrophys. 672, Art. No. L13 (2023).
The molecules were identified in the course of a molecular line survey with the 40 m Yebes radio telescope between 31.0 and 50.3 GHz. All identifications relied on quantum chemical calculations in the absense of Laboratory spectroscopic data. Seven successive, unblended transitions with 11 ≤ J“ ≤ 17 were identified for MgC₄H⁺. In addition, nine successive transitions with 25 ≤ J” ≤ 33 were identified between 72.4 and 95.6 GHz in data of an IRAM 30 m molecular line survey; two transitions were partly blended. 16 transitions with 26 ≤ J“ ≤ 41 were accessed in the case of MgC₆H⁺. Four transitions were partly blended, one was blended heavily. The rotational temperature is about 13.5 K. It is less abundant than sodium (iso) cyanide by a factor of about 250 to 750.

Contributor(s): H. S. P. Müller; 05, 2023