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The object of this study is one of the most energetic and luminous molecularoutflows known in the Galaxy, G331.512-0.103. Observations with ALMA Band 7(350 GHz; 0.86 mm) reveal a very compact, extremely young bipolar outflow and amore symmetric outflowing shocked shell surrounding a very small region ofionized gas. The velocities of the bipolar outflow are about 70 km s^{-1} oneither side of the systemic velocity. The expansion velocity of the shockedshell is ~24 km s^{-1}, implying a crossing time of about 2000 yrs. Along thesymmetry axis of the outflow, there is a velocity feature, which could be amolecular "bullet" of high-velocity dense material. The source is one of theyoungest examples of massive molecular outflow found associated with ahigh-mass star.

ALMA observations of the massive molecular outflow G331.512-0.103