First detection in space of the high-energy isomer of cyanomethanimine: H2CNCN
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arXiv
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| Natura: | Preprint |
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2024
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| author | Andrés, David San Rivilla, Víctor M. Colzi, Laura Jiménez-Serra, Izaskun Martín-Pintado, Jesús Megías, Andrés López-Gallifa, Álvaro Martínez-Henares, Antonio Massalkhi, Sarah Zeng, Shaoshan Sanz-Novo, Miguel Tercero, Belén de Vicente, Pablo Martín, Sergio Requena-Torres, Miguel A. Molpeceres, Germán de la Concepción, Juan García |
| author_facet | Andrés, David San Rivilla, Víctor M. Colzi, Laura Jiménez-Serra, Izaskun Martín-Pintado, Jesús Megías, Andrés López-Gallifa, Álvaro Martínez-Henares, Antonio Massalkhi, Sarah Zeng, Shaoshan Sanz-Novo, Miguel Tercero, Belén de Vicente, Pablo Martín, Sergio Requena-Torres, Miguel A. Molpeceres, Germán de la Concepción, Juan García |
| contents | We report the first detection in the interstellar medium of $N$-cyanomethanimine (H$_2$CNCN), the stable dimer of HCN of highest energy, and the most complex organic molecule identified in space containing the prebiotically relevant NCN backbone. We have identified a plethora of $a$-type rotational transitions with 3 $\leq J_\text{up} \leq$ 11 and $K_\text{a} \leq$ 2 that belong to this species towards the Galactic Center G+0.693-0.027 molecular cloud, the only interstellar source showing the three cyanomethanimine isomers (including the $Z$- and $E$- isomers of $C$-cyanomethanimine, HNCHCN). We have derived a total column density for H$_2$CNCN of (2.9$\, \pm \,$0.1)$\times$10$^{12}$ cm$^{-2}$, which translates into a total molecular abundance with respect to H$_2$ of (2.1$\, \pm \,$0.3)$\times$10$^{-11}$. We have also revisited the previous detection of $E$- and $Z$-HNCHCN, and found a total $C/N$-cyanomethanimine abundance ratio of 31.8$\, \pm \,$1.8 and a $Z/E$-HNCHCN ratio of 4.5$\, \pm \,$0.2. While the latter can be explained on the basis of thermodynamic equilibrium, chemical kinetics are more likely responsible for the observed $C/N$-cyanomethanimine abundance ratio, where the gas-phase reaction between methanimine (CH$_2$NH) and the cyanogen radical (CN) arises as the primary formation route. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03334 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First detection in space of the high-energy isomer of cyanomethanimine: H2CNCN Andrés, David San Rivilla, Víctor M. Colzi, Laura Jiménez-Serra, Izaskun Martín-Pintado, Jesús Megías, Andrés López-Gallifa, Álvaro Martínez-Henares, Antonio Massalkhi, Sarah Zeng, Shaoshan Sanz-Novo, Miguel Tercero, Belén de Vicente, Pablo Martín, Sergio Requena-Torres, Miguel A. Molpeceres, Germán de la Concepción, Juan García Astrophysics of Galaxies We report the first detection in the interstellar medium of $N$-cyanomethanimine (H$_2$CNCN), the stable dimer of HCN of highest energy, and the most complex organic molecule identified in space containing the prebiotically relevant NCN backbone. We have identified a plethora of $a$-type rotational transitions with 3 $\leq J_\text{up} \leq$ 11 and $K_\text{a} \leq$ 2 that belong to this species towards the Galactic Center G+0.693-0.027 molecular cloud, the only interstellar source showing the three cyanomethanimine isomers (including the $Z$- and $E$- isomers of $C$-cyanomethanimine, HNCHCN). We have derived a total column density for H$_2$CNCN of (2.9$\, \pm \,$0.1)$\times$10$^{12}$ cm$^{-2}$, which translates into a total molecular abundance with respect to H$_2$ of (2.1$\, \pm \,$0.3)$\times$10$^{-11}$. We have also revisited the previous detection of $E$- and $Z$-HNCHCN, and found a total $C/N$-cyanomethanimine abundance ratio of 31.8$\, \pm \,$1.8 and a $Z/E$-HNCHCN ratio of 4.5$\, \pm \,$0.2. While the latter can be explained on the basis of thermodynamic equilibrium, chemical kinetics are more likely responsible for the observed $C/N$-cyanomethanimine abundance ratio, where the gas-phase reaction between methanimine (CH$_2$NH) and the cyanogen radical (CN) arises as the primary formation route. |
| title | First detection in space of the high-energy isomer of cyanomethanimine: H2CNCN |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.03334 |