The water and methanol masers in the face-on accretion system around the high-mass protostar G353.273+0.641
Abstract
We report on a direct comparison of VLBI maser data and ALMA thermal-emission data for the high-mass protostar G353.273+0.641. We detected a gravitationally-unstable disk by dust and a high-velocity jet traced by a thermal CO line by ALMA long-baselines (LB). 6.7 GHz CH3OH masers trace infalling streamlines inside the disk. The innermost maser ring indicates another compact accretion disk of 30 au. Such a nested system could be caused by angular momentum transfer by the spiral arms. 22 GHz H2O masers trace the jet-accelerating region, which are directly connecting the CO jet and the protostar. The recurrent maser flares imply episodic jet ejections per 1-2 yr, while typical separation of CO knots indicates a variation of outflow rate per 100 yr. Our study demonstrates that VLBI maser observations are still a powerful tool to explore detailed structures nearby high-mass protostars by combining ALMA LB.
- Publication:
-
Cosmic Masers: Proper Motion Toward the Next-Generation Large Projects
- Pub Date:
- 2024
- DOI:
- 10.1017/S1743921323003216
- Bibcode:
- 2024IAUS..380..172M
- Keywords:
-
- ISM:jets and outflows;
- accretion disks;
- stars: massive;
- stars: protostars