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

• Published in: The Astrophysical journal Vol. 937; no. 2; pp. 51 - 60
• Main Authors: Guzmán Ccolque, Estrella, Fernández-López, Manuel, Zapata, Luis A., Baug, Tapas
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.10.2022; IOP Publishing
• Subjects: Astrophysics; Carbon monoxide; Dispersal; Dispersion; Emission; Energy budget; Filaments; Galaxies; Interferometers; Interstellar dynamics; Kinematics; Kinetic energy; Massive stars; Outflow; Radio telescopes; Star & galaxy formation; Star formation; Star formation rate; Submillimeter astronomy; Supernovae; Velocity gradient
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/ac8c35

Abstract 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 (∼10 4 M ☉ km s −1 ), and its kinetic energy (∼10 48–49 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.