Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 region. IV Interaction between the Outflow and the Dense Gas in the Cluster Forming Region of OMC-2 FIR 6

TL;DR

This study uses millimeter interferometry to investigate the interaction between outflows and dense gas in the OMC-2 FIR 6 star-forming region, revealing core structures and outflow dynamics.

Contribution

It provides high-resolution observations of core structures and outflow interactions in OMC-2 FIR 6, highlighting the impact of outflows on dense gas in a cluster-forming environment.

Findings

Detected multiple dusty cores in FIR 6a, 6b, 6c, 6d.

Observed molecular outflows and jet-like features in FIR 6c.

Identified interaction and bowshock front between outflow and dense cores.

Abstract

We have conducted millimeter interferometric observations of the Orion Molecular Cloud-2 (OMC-2) FIR 6 region at an angular resolution of $\sim$ 4$\arcsec$ - 7$\arcsec$ with the Nobeyama Millimeter Array (NMA). In the 3.3 mm continuum emission we detected dusty core counterparts of the previously identified FIR sources (FIR 6a, 6b, 6c, and 6d), and moreover, resolved FIR 6a into three dusty cores. The size and mass of these cores are estimated to be 1100-5900 AU and 0.19-5.5 M$_{\odot}$, respectively. We found that in the $^{12}$CO ($J$=1--0) emission FIR 6b, 6c, and 6d eject the molecular outflow and that the FIR 6c outflow also exhibits at least two collimated jet-like components in the SiO ($J$=2--1) emission. At the tip of one of the SiO components there appears abrupt increase of the SiO line width ($\sim$ 15 km s$^{-1}$), where the three resolved cores in FIR 6a seem to delineate the tip. These results imply the presence of the interaction and the bowshock front between the FIR 6c molecular outflow and FIR 6a.