SOLIS XVII: Jet candidate unveiled in OMC-2 and its possible link to the enhanced cosmic-ray ionisation rate
Journal
Date Issued
2023
Author(s)
Lattanzi, V.
•
Alves, F. O.
•
•
•
Caselli, P.
•
Ceccarelli, C.
•
A. López-Sepulcre
•
Favre, C.
•
Neri, R.
•
Chahine, L.
•
Vastel, C.
•
Evans, L.
Abstract
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. 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. 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. 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. 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.
Volume
671
Start page
A35
Issn Identifier
0004-6361
Rights
open.access
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