Visit ASIAA Homepage Registration Deadline: November 27, 2019 (Taiwan Time)
East-Asian ALMA Science Workshop 2019
February 19(Wed)-21(Fri), 2020
ASIAA, Taipei, Taiwan

Poster Presentation

Star formation triggered by cloud-cloud collision

Author(s): Fumitaka Nakamura (NAOJ), Shinichi Kinoshita (Tokyo), Wanggi Lim (Sophia), et al.

Presenter: Fumitaka Nakamura (National Astronomical Observatory of Japan)

Cloud-cloud collision is one of the important processes to trigger star formation in our Galaxy. On the basis of wide-field mapping data of 12CO, 13CO, and so on, we discuss a possibility of the cloud-cloud collision triggered star formation in two nearby star-forming regions: Orion A (400pc) and M17 (2kpc). For Orion A, we compare CARMA-NRO combined 13CO map having 8" resolution with IN-SYNC stellar velocity data/CII map. We found that significant velocity offsets between 13CO and Vstar/CII profiles which appear to be consistent with the cloud-cloud collision scenario. For M17, we found, using 13CO NRO map, that in the IRDC region, two distinct clouds with 20km/s and 35km/s. The diffuse emission is distributed in the velocity range between 20 and 35 km/s (a bridge feature) and the magnetic field orientation appears to be changed near the boundaries of the two clouds (This would give the first observational example that the cloud-cloud collision causes the kink of the global magnetic field at the interacting region).
These observational facts support a scenario that the cloud-cloud collision with a speed of 15 km/s may initiate the future high-mass star formation in the M17 IRDC. The parallel dense filament network observed in this region might have been created by the gravitational instability of the interacting region. We conclude that in these two particular regions, the cloud-cloud collision may play important roles in triggering star formation.

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