Visit ASIAA Homepage Registration Deadline: August 15, 2019 (Taiwan Time)
Science with the Submillimeter Array: Present and Future
November 4(Mon)-5(Tue), 2019
ASIAA, Taipei, Taiwan

Oral Presentation

Sequential High-mass Star Formation in the G9.62+0.19 Complex

Author(s): Tie Liu (SHAO)

Presenter: Tie Liu (Shanghai Astronomical Observatory)

Stellar feedback from high-mass stars (e.g., H II regions) can strongly influence the surrounding interstellar medium and regulate star formation. Our SMA and ALMA observations reveal sequential high-mass star formation taking place within one subvirial filamentary clump (the G9.62 clump) in the G9.62+0.19 complex. The dense cores (MM1-MM12) detected by SMA and ALMA are at very different evolutionary stages, from the starless core phase to the UC H II region phase. Three dense cores (MM6, MM7/G, MM8/F) are associated with outflows. Five cores (MM1, MM3, MM5, MM9, MM10) are massive starless core candidates whose masses are estimated to be larger than 25 M ☉, assuming a dust temperature of ≤20 K. The shocks from the expanding H II regions (“B” and “C”) to the west may have a great impact on the G9.62 clump by compressing it into a filament and inducing core collapse successively, leading to sequential star formation. Our findings suggest that stellar feedback from H II regions may enhance the star formation efficiency and suppress low-mass star formation in adjacent pre-existing massive clumps. I will also present some preliminary results from our SMA and JCMT polarization observations toward this region, which reveal magnetic fields compressed by the expanding HII regions.

ASIAA will not contact participants for credit card information. Privacy and Security Policy