The object of this study is one of the most energetic and luminous molecular outflows 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 a more symmetric outflowing shocked shell surrounding a very small region of ionized gas. The velocities of the bipolar outflow are about 70 km s^{-1} on either side of the systemic velocity. The expansion velocity of the shocked shell is ~24 km s^{-1}, implying a crossing time of about 2000 yrs. Along the symmetry axis of the outflow, there is a velocity feature, which could be a molecular "bullet" of high-velocity dense material. The source is one of the youngest examples of massive molecular outflow found associated with a high-mass star.
@article{arxiv.1307.6244,
title = {ALMA observations of the massive molecular outflow G331.512-0.103},
author = {Manuel Merello and Leonardo Bronfman and Guido Garay and Nadia Lo and Neal J. Evans and Lars-Ake Nyman and Juan R. Cortés and Maria R. Cunningham},
journal= {arXiv preprint arXiv:1307.6244},
year = {2015}
}
Comments
9 pages, 4 figures, 1 table, Accepted for publication in The Astrophysical Journal Letters, small typos corrected