| Issue |
A&A
Volume 674, June 2023
|
|
|---|---|---|
| Article Number | L4 | |
| Number of page(s) | 10 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202346722 | |
| Published online | 05 June 2023 | |
Letter to the Editor
The spatial distribution of an aromatic molecule, C6H5CN, in the cold dark cloud TMC-1⋆
1
Dept. of Molecular Astrophysics, Instituto de Física Fundamental (IFF-CSIC), C/ Serrano 121, 28006 Madrid, Spain
e-mail: jose.cernicharo@csic.es
2
Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain
3
Observatorio Astronómico Nacional (OAN, IGN), Madrid, Spain
Received:
21
April
2023
Accepted:
21
May
2023
We present a highly sensitive 2D line survey of TMC-1 obtained with the Yebes 40 m radio telescope in the Q-band (31.13–49.53 GHz). These maps cover a region of 320″×320″ centred on the position of the QUIJOTE line survey with a spatial sampling of 20″. The region covering 240″×240″, where a longer integration time was used, shows a homogenous sensitivity of 2–4 mK across the band. We present in this work the first determination of the spatial extent of benzonitrile (C6H5CN), which follows that of cyanopolyynes rather well, but differs significantly from that of the radicals CnH and CnN. We definitively conclude that aromatic species in TMC-1 are formed from chemical reactions involving smaller species in the densest zones of the cloud.
Key words: molecular data / line: identification / ISM: molecules / ISM: individual objects: TMC-1 / astrochemistry
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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