ALMA Fragmented Source Catalogue in Orion (FraSCO) I. Outflow interaction within an embedded cluster in OMC-2/FIR3, FIR4, and FIR5

Abstract

We present a high angular resolution ($\sim 1"$) and wide-field ($2^{\prime }.9\times 1^{\prime }.9$) image of the 1.3-mm continuum, CO($J$ = 2--1) line, and SiO($J$ = 5--4) line emissions toward an embedded protocluster, FIR3, FIR4, and FIR5, in the Orion Molecular Cloud 2 obtained from the Atacama Large Millimeter/submillimeter Array (ALMA). We identify 51 continuum sources, 36 of which are newly identified in this study. Their dust masses, projected sizes, and ${\mathrm{H}}_2$ gas number densities are estimated to be $3.8\times 10^{-5}$--$1.1\times 10^{-2}{\mathrm{M}}_{\odot }$, 290--2000 au, and $6.4\times 10^6$--$3.3\times 10^8\mathrm{c}{\mathrm{m}}^{-3}$, respectively. The results of a Jeans analysis show that $\sim 80\%$ of the protostellar sources and $\sim 15\%$ of the prestellar sources are gravitationally bound. We identify 12 molecular outflows traced in the CO($J$ = 2--1) emission, six of which are newly detected. We spatially resolve shocked gas structures traced by the SiO($J$ = 5--4) emission in this region for the first time. We identify shocked gas originating from outflows and other shocked regions. These results provide direct evidence of an interaction between a dust condensation, FIR4, and an energetic outflow driven by HOPS-370 located within FIR3. A comparison of the outflow dynamical timescales, fragmentation timescales, and protostellar ages shows that the previously proposed triggered star-formation scenario in FIR4 is not strongly supported. We also discuss the spatial distribution of filaments identified in our continuum image by comparing it with a previously identified hub-fiber system in the ${\mathrm{N}}_2{\mathrm{H}}^{+}$ line.

arXiv comment45 pages, 24 figures, 2 figure sets, 2 animations, Accepted for publication in ApJ

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