Oral Presentation

ALMA fragmented source and outflow catalogue in OMC-2/FIR3, FIR4, and FIR5

Author(s): Asako Sato (Kyushu Univ.), Satoko Takahashi, Shun Ishii (NAOJ, SOKENDAI), Masahiro Machida (Kyushu Univ.), Paul Ho (ASIAA, EAO), John Carpenter (JAO, NRAO), Luis A. Zapata (IRyA), Paula Teixeira (Univ. of St Andrews), Sumeyye Suri (Univ. of Vienna)

Presenter: Asako Sato (Kyushu University)

The Orion Molecular Cloud 2 (OMC-2) is an embedded protocluster containing a large number of infrared sources (400 pc-2) and located within the northern part of Orion A molecular cloud (d = 400 pc). In the OMC-2, we focus on a dense region where three-millimeter sources (FIR3, FIR4, and FIR5) are located. Previous studies detected fifteen young sources in the dense region. Using the Atacama Large Millimeter/submillimeter Array (ALMA), we performed 1.3 mm dust continuum, CO(J = 2--1) line, and SiO(J = 5--4) line observations toward the OMC-2/FIR3 – FIR5 with mosaic mapping (~2’.9 × 1’.9) and three times higher angular resolution (~1") than those of previous mm/sub-mm mosaic observations. We aim to identify dust sources and molecular outflows with the continuum and CO line emissions, respectively. Furthermore, we aim to detect SiO line emission tracing gasses originating from the outflows and other shocked regions. In this poster, we mainly show the results of the identifications of the dust sources, molecular outflows, and shocked gas regions. Our results also show direct evidence to explain the interaction of an energetic outflow driven from the FIR3 with the FIR4, enabling us to discuss possible scenarios of the protocluster star-forming environment in the OMC-2 region.