Collision of molecular outflows in the L1448--C system

Abstract

We present a study of the central zone of the star-forming region L1448 at 217--230 GHz ($\sim$ 1.3 mm) using ALMA observations. Our study focuses on the detection of proto-stellar molecular outflows and the interaction with the surrounding medium toward sources L1448--C(N) and L1448--C(S). Both sources exhibit continuum emission, with L1448--C(N) being the brightest one. Based on its spectral index and the associated bipolar outflow, the continuum emission is the most likely to be associated with a circumstellar disk. The ${}^{12}$CO(J=2$\to$1) and SiO(J= 5$\to$4) emissions associated with L1448--C(N) trace a bipolar outflow and a jet oriented along the northwest-southeast direction. The ${}^{12}$CO(J=2$\to$1) outflow for L1448--C(N) has a wide-open angle and a V-shape morphology. The SiO jet is highly collimated and has an axial extent comparable with the ${}^{12}$CO(J=2$\to$1) emission. There is not SiO(J= 5$\to$4) emission towards L1448--C(S), but there is ${}^{12}$CO(J=2$\to$1) emission. The observations revealed that the red-shifted lobes of the ${}^{12}$CO(J=2$\to$1) outflows of L1448--C(N) and L1448--C(S) are colliding. As a result of this interaction, the L1448-C(S) lobe seems to be truncated. The collision of the molecular outflows is also hinted by the SiO(J= 5$\to$4) emission, where the velocity dispersion increases significantly in the interaction zone. We also investigated whether it could be possible that this collision triggers the formation of new stars in the L1448--C system.

11 pages, 7 figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS) DOI: 10.1093/mnras/stad988

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Cited by in corpus (8)

• JWST Observations of Young protoStars (JOYS). Overview of gaseous molecular emission and absorption in low-mass protostars
• ALMA view of the L1448-mm protostellar system on disk scales: CH${}_3$OH and H${}^{13}$CN as new disk wind tracers
• The Asymmetric Bipolar Fe II Jet and H2 Outflow of TMC1A Resolved with JWST's NIRSpec IFU
• PRODIGE -- envelope to disk with NOEMA. IV. An infalling gas bridge surrounding two Class 0/I systems in L1448N
• ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Nested Morphological and Kinematic Structures of Outflows Revealed in SiO and CO Emission
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow
• Erosion of a dense molecular core by a strong outflow from a massive protostar
• Unveiling the collision between molecular outflows: observational evidence and hydrodynamic simulations