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キーワード:
stars: formation
ISM: clouds
ISM: individual objects: G350.54+0.69
ISM: molecules
ISM: structure
infrared: ISM
Astrophysics -
Astrophysics of Galaxies
Astrophysics - Solar and Stellar Astrophysics
要旨:
We use APEX mapping observations of 13CO and C18O (2-1) to investigate the internal gas kinematics of the filamentary cloud G350.54+0.69, composed of the two distinct filaments G350.5-N and G350.5-S. G350.54+0.69 as a whole is supersonic and gravitationally bound. We find a large-scale periodic velocity oscillation along the entire G350.5-N filament with a wavelength of ~1.3 pc and an amplitude of ~0.12 km s-1. Comparing with gravitational-instability- induced core formation models, we conjecture that this periodic velocity oscillation could be driven by a combination of longitudinal gravitational instability and a large-scale periodic physical oscillation along the filament. The latter may be an example of a magnetohydrodynamic transverse wave. This hypothesis can be tested with Zeeman and dust polarization measurements.
