A High Velocity SiO Jet from S255N SMA3

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ID: 326984
2026
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Abstract
Abstract We present ALMA Band 6 observations of the compact source SMA3 in the S255IR region, analysing both SiO (J = 5-4, 6-5) and CS (J = 5-4) emission to characterise the structure and kinematics of its outflow. The data reveal a highly collimated bipolar jet traced by SiO, reaching line-of-sight velocities of up to ±60 km s−1 and de-projected velocities of ±~80 km s−1, with a collimation ratio of ~4.7 over a spatial extent of ~5800 au. The inferred dynamical age is 343 yr. Position-velocity diagrams exhibit a continuous velocity structure with triangular morphology, consistent with a steady disk wind rather than an episodic or X-wind-driven flow. Excitation analysis yields a characteristic SiO temperature of ~42 K, and we derive the jet mass, momentum, and kinetic energy which are indicative of a dense, mass-loaded molecular outflow. The emission shows clear chemical and kinematic differentiation: SiO traces the high-velocity jet spine, while CS is observed at lower velocities close to the protostar, and only reaches high velocities at larger distances. Despite forming within a clustered high-mass star-forming region, the jet exhibits a high degree of symmetry, collimation, and dynamical coherence more commonly associated with protostars forming in isolation or less crowded star-forming regions. This demonstrates that well-ordered, narrowly collimated, disk-driven jets can be launched and maintained even in the dense, competitive environments characteristic of high-mass star formation.
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Authors P. D. Klaassen, M. Reiter, Y. Zhang, K. E. I Tanaka, A.E. Guzmán
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1645
URL
https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag1645/70895920/stag1645.pdf
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