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2022ApJ...937...51G - Astrophys. J., 937, 51 (2022/October-1)

Possible Explosive Dispersal Outflow in IRAS 16076-5134 Revealed with ALMA.

GUZMAN CCOLQUE E., FERNANDEZ-LOPEZ M., ZAPATA L.A. and BAUG T.

Abstract (from CDS):

We present 0.9 mm continuum and CO(3-2) line emission observations retrieved from the Atacama Large Millimeter/submillimeter Array archive toward the high-mass star formation region IRAS 16076-5134. We identify 14 dense cores with masses between 0.3 and 22 M. We find an ensemble of filament-like CO(3-2) ejections from -62 to +83 km s–1 that appear to arise radially from a common central position, close to the dense core MM8. The ensemble of filaments has a quasi-isotropic distribution in the plane of the sky. The radial velocities of several filaments follow a linear velocity gradient, increasing from a common origin. Considering the whole ensemble of filaments, we estimate the total mass to be 138 and 216 M, from its CO emission, for 70 K and 140 K, respectively. Also, assuming a constant velocity expansion for the filaments (of 83 km s–1), we estimate the dynamical age of the outflowing material (3500 yr), its momentum (∼104M km s–1), and its kinetic energy (∼1048–49 erg). The morphology and kinematics presented by the filaments suggest the presence of a dispersal outflow with explosive characteristics in IRAS 16076-5134. In addition, we make a raw estimate of the lower limit of the frequency rate of the explosive dispersal outflows in the galaxy (one every 110 yr), considering a constant star formation rate and efficiency, with respect to the galactocentric radius of the galaxy. This may imply a comparable rate between dispersal outflows and supernovae (approximately one every 50 yr), which may be important for the energy budget of the and the link between dispersal outflows and high-mass star formation.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interferometers - Star formation - Submillimeter astronomy - Interstellar dynamics

Simbad objects: 9

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