Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 Region. III. An Extensive Survey for Molecular Outflows

TL;DR

This study conducted a comprehensive survey of molecular outflows in the Orion Molecular Cloud-2/3 region using millimeter and submillimeter observations, revealing new outflows and analyzing their physical properties.

Contribution

It provides the first extensive CO (3-2) outflow survey in OMC-2/3, demonstrating CO (3-2) as a more effective tracer and comparing outflow properties across different star-forming regions.

Findings

14 CO outflows detected, 7 newly identified

CO (3-2) outflows show higher detection rates

Outflow momentum correlates with source luminosity and envelope mass

Abstract

Using the ASTE 10 m submillimeter telescope and the 1.4 m Infrared Survey Facility (IRSF), we performed an extensive outflow survey in the Orion Molecular Cloud -2 and -3 region. Our survey, which includes 41 potential star-forming sites, has been newly compiled using multi-wavelength data based on millimeter- and submillimeter-continuum observations as well as radio continuum observations. From the CO (3-2) observations performed with the ASTE 10 m telescope, we detected 14 CO molecular outflows, seven of which were newly identified. This higher detection rate, as compared to previous CO (1-0) results in the same region, suggests that CO (3-2) may be a better outflow tracer. Physical properties of these outflows and their possible driving sources were derived. Derived parameters were compared with those of CO outflows in low- and high-mass starforming regions. We show that the CO outflow momentum correlates with the bolometric luminosity of the driving source and with the envelope mass, regardless of the mass of the driving sources. In addition to these CO outflows, seven sources having NIR features suggestive of outflows were also identified.