Revealing a Centrally Condensed Structure in OMC-3/MMS 3 with ALMA High-resolution Observations
Abstract
Using the Atacama Large Millimeter/submillimeter Array (ALMA), we investigated the peculiar millimeter source MMS 3 located in the Orion Molecular Cloud 3 (OMC-3) region in the 1.3 mm continuum, CO (J = 2-1), SiO (J = 5-4), C18O (J = 2-1), N2D+ (J = 3-2), and DCN (J = 3-2) emissions. With the ALMA high angular resolution (∼0"2), we detected a very compact and highly centrally condensed continuum emission with a size of 0"45 × 0"32 (P.A. = 0°22). The peak position coincides with the locations of previously reported Spitzer/IRAC and X-ray sources within their positional uncertainties. We also detected an envelope with a diameter of ∼6800 au (P.A. = 75°) in the C18O (J = 2-1) emission. Moreover, a bipolar outflow was detected in the CO (J = 2-1) emission for the first time. The outflow is elongated roughly perpendicular to the long axis of the envelope detected in the C18O (J = 2-1) emission. Compact high-velocity CO gas in the (redshifted) velocity range of 22-30 km s-1, presumably tracing a jet, was detected near the 1.3 mm continuum peak. A compact and faint redshifted SiO emission was marginally detected in the CO outflow lobe. The physical quantities of the outflow in MMS 3 are somewhat smaller than those in other sources in the OMC-3 region. The centrally condensed object associated with the near-infrared and X-ray sources, the flattened envelope, and the faint outflow indicate that MMS 3 harbors a low-mass protostar with an age of ∼103 yr.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 2021
- DOI:
- 10.3847/1538-4357/abe61c
- arXiv:
- arXiv:2102.07793
- Bibcode:
- 2021ApJ...910..148M
- Keywords:
-
- Star formation;
- Protostars;
- 1569;
- 1302;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 15 pages, 6 figures, 4 tables, accepted for publication in ApJ