Large-scale periodic velocity oscillation in the filamentary cloud G350.54+0.69

Liu, Hong-Li; Stutz, Amelia; Yuan, Jing-Hua

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学術論文

Large-scale periodic velocity oscillation in the filamentary cloud G350.54+0.69

MPS-Authors

Liu, Hong-Li
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stutz, Amelia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yuan, Jing-Hua
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.1259L
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引用

Liu, H.-L., Stutz, A., & Yuan, J.-H. (2019). Large-scale periodic velocity oscillation in the filamentary cloud G350.54+0.69. Monthly Notices of the Royal Astronomical Society, 487, 1259-1268.

引用: https://hdl.handle.net/21.11116/0000-0005-D329-F

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.