The Dense Gas Structures around MMS 2/OMC-3 Traced by C18O Emission
4 affiliations
- 1Chinese Academy of Sciences
- 2National Astronomical Observatory of Japan
- 3The Graduate University for Advanced Studies
- 4Kyushu University
Abstract
We report the Atacama Large Millimeter/submillimeter Array observations of 1.3 mm continuum, C ¹⁸ O ( J = 2−1), and N ₂ D ⁺ ( J = 3−2) toward the millimeter multisystem MMS 2 in the Orion molecular cloud 3 region at an angular resolution of 1 . ″ 59 (∼620 au). MMS 2 is in the flat-spectrum phase, with its protostars in the late stage of the main accretion phase. We detect the centrally condensed structures traced by C ¹⁸ O emission associated with the 1.3 mm continuum sources MMS 2-North and MMS 2-South, which are spatially resolved and unresolved, respectively. The estimated diameter and mass of the centrally condensed structure associated with MMS 2-North are 1 . ″ 64 (∼640 au) and 3.0 × 10 ⁻⁴ M ⊙ , respectively. We also detect an extended structure traced by C ¹⁸ O emission associated with the circumbinary envelope at a scale of 5 . ″ 70 (∼2240 au) with an estimated gas mass of 1.4 × 10 ⁻² M ⊙ . In addition, we detect a filamentary structure traced by N ₂ D ⁺ emission to the south of MMS 2, which is spatially offset from the C ¹⁸ O emission. This offset may be attributed to the influence of the warm surrounding environment.
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BibTeX
@article{柳2026dense,
title = {{The Dense Gas Structures around MMS 2/OMC-3 Traced by C18O Emission}},
author = {Yuhua 玉华 Liu 柳 and Satoko 橋智子 Takahashi 髙 and Masahiro N. Machida},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aea60f},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea60f},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - The Dense Gas Structures around MMS 2/OMC-3 Traced by C18O Emission
AU - Yuhua 玉华 Liu 柳
AU - Satoko 橋智子 Takahashi 髙
AU - Masahiro N. Machida
PY - 2026
DA - 2026/10/29
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aea60f
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aea60f
AB - We report the Atacama Large Millimeter/submillimeter Array observations of 1.3 mm continuum, C ¹⁸ O ( J = 2−1), and N ₂ D ⁺ ( J = 3−2) toward the millimeter multisystem MMS 2 in the Orion molecular cloud 3 region at an angular resolution of 1 . ″ 59 (∼620 au). MMS 2 is in the flat-spectrum phase, with its protostars in the late stage of the main accretion phase. We detect the centrally condensed structures traced by C ¹⁸ O emission associated with the 1.3 mm continuum sources MMS 2-North and MMS 2-South, which are spatially resolved and unresolved, respectively. The estimated diameter and mass of the centrally condensed structure associated with MMS 2-North are 1 . ″ 64 (∼640 au) and 3.0 × 10 ⁻⁴ M ⊙ , respectively. We also detect an extended structure traced by C ¹⁸ O emission associated with the circumbinary envelope at a scale of 5 . ″ 70 (∼2240 au) with an estimated gas mass of 1.4 × 10 ⁻² M ⊙ . In addition, we detect a filamentary structure traced by N ₂ D ⁺ emission to the south of MMS 2, which is spatially offset from the C ¹⁸ O emission. This offset may be attributed to the influence of the warm surrounding environment.
SN - 1538-4357
SN - 0004-637X
ER -