| Issue |
A&A
Volume 671, March 2023
|
|
|---|---|---|
| Article Number | A35 | |
| Number of page(s) | 8 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361/202142736 | |
| Published online | 06 March 2023 | |
SOLIS
XVII. Jet candidate unveiled in OMC-2 and its possible link to the enhanced cosmic-ray ionisation rate★
1
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik,
Gießenbachstraße 1,
85748
Garching,
Germany
e-mail: lattanzi@mpe.mpg.de
2
INAF – Osservatorio Astrofisico di Arcetri,
Largo E. Fermi 5,
50125
Firenze,
Italy
3
Univ. Grenoble Alpes, CNRS, IPAG,
38000
Grenoble,
France
4
Institut de Radioastronomie Millimetrique,
300 rue de la Piscine, Domaine Universitaire de Grenoble,
38406
Saint-Martin d’Hères,
France
5
École doctorale de Physique, Université Grenoble Alpes,
110 Rue de la Chimie,
38400
Saint-Martin-d’Hères,
France
6
IRAP, Université de Toulouse,
9 avenue du colonel Roche,
31028
Toulouse Cedex 4,
France
Received:
23
November
2021
Accepted:
18
January
2023
Context. The study of the early phases of star and planet formation is important to understand the physical and chemical history of stellar systems such as our own. In particular, protostars born in rich clusters are prototypes of the young Solar System.
Aims. In the framework of the Seeds Of Life In Space (SOLIS) large observational project, the aim of the present work is to investigate the origin of the previously inferred high flux of energetic particles in the protocluster FIR4 of the Orion Molecular Cloud 2 (OMC-2), which appears asymmetric within the protocluster itself.
Methods. Interferometric observations carried out with the IRAM NOEMA interferometer were used to map the silicon monoxide (SiO) emission around the FIR4 protocluster. Complementary archival data from the ALMA interferometer were also employed to help constrain excitation conditions. A physical-chemical model was implemented to characterise the particle acceleration along the protostellar jet candidate, along with a non-LTE analysis of the SiO emission along the jet.
Results. The emission morphology of the SiO rotational transitions hints for the first time at the presence of a collimated jet originating very close to the brightest protostar in the cluster, HOPS-108.
Conclusions. The NOEMA observations unveiled a possible jet in the OMC-2 FIR4 protocluster propagating towards a previously measured enhanced cosmic-ray ionisation rate. This suggests that energetic particle acceleration by the jet shock close to the protostar might be at the origin of the enhanced cosmic-ray ionisation rate, as confirmed by modelling the protostellar jet.
Key words: ISM: molecules / ISM: jets and outflows / line: identification / molecular data / molecular processes / radio lines: ISM
© 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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Open Access funding provided by Max Planck Society.
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