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

被引：18

作者：

Cabezas, C. ^{[1
]}

Pardo, J. R. ^{[1
]}

Agundez, M. ^{[1
]}

Tercero, B. ^{[2
,3
]}

Marcelino, N. ^{[2
,3
]}

Endo, Y. ^{[4
]}

de Vicente, P. ^{[3
]}

Guelin, M. ^{[5
]}

Cernicharo, J. ^{[1
]}

机构：

[1] CSIC, IFF, Dept Astrofis Mol, C Serrano 121, Madrid 28006, Spain

[2] Observ Yebes IGN, Ctr Desarrollos Tecnol, Guadalajara 19141, Spain

[3] OAN, IGN, Madrid, Spain

[4] Natl Yang Ming Chiao Tung Univ, Dept Appl Chem, Sci Bldg 2,1001 Ta Hsueh Rd, Hsinchu 300098, Taiwan

[5] Inst Radioastron Millimetr, 300 Rue Piscine, F-38406 St Martin Dheres, France

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 672卷

关键词：

molecular data; line; identification; ISM; molecules; individual objects; IRC+10216; astrochemistry; CIRCUMSTELLAR ENVELOPE; ASTRONOMICAL DISCOVERY; IDENTIFICATION; INTERSTELLAR; SUBMILLIMETER; SPECTROSCOPY; MOLECULE; NACN; MGNC;

D O I：

10.1051/0004-6361/202346462

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 J(u) 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) x 10(12) 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) x 10(11) cm(-2).

引用

页数：6

共 54 条

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