ALMA Reveals A Collision Between Protostellar Outflows in BHR71

Abstract

For a binary protostellar outflow system in which its members are located so close to each other (the separation being smaller than the addition of the widths of the flows) and with large opening angles, the collision seems unavoidable regardless of the orientation of the outflows. This is in contrast to the current observational evidence of just a few regions with indications of colliding outflows. Here, using sensitive observations of the Atacama Large Millimeter/Submillimeter Array (ALMA), we report resolved images of carbon monoxide (CO) towards the binary flows associated with the BHR71 protostellar system. These images reveal for the first time solid evidence that their flows are partially colliding, increasing the brightness of the CO, the dispersion of the velocities in the interaction zone, and changing part of the orientation in one of the flows. Additionally, this impact opened the possibility of knowing the 3D geometry of the system, revealing that one of its components (IRS2) should be closer to us.

Submitted to AJ, comments are welcome

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Cited by in corpus (11)

• FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
• ALMA Observations of the Extraordinary Carina Pillars: HH 901/902
• Collision of molecular outflows in the L1448--C system
• Collision of protostellar jets in the star-forming region IC 1396N. Analysis of knot proper motions
• Outer rotation curve of the Galaxy with VERA IV: Astrometry of IRAS 01123+6430 and the possibility of cloud-cloud collision
• Protostellar Outflows: a window to the past
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• NIR spectroscopic survey of protostellar jets in the star forming region IC 1396N