Paper detail

Focusing MHD Wave as a Trigger of Star Formation

Propagation of fast-mode magnetohydrodynamic (MHD) waves in the interstellar space is simulated, and focusing MHD wave (FMW) model is proposed for triggered star formation (SF). Waves from an SF region are trapped by nearby molecular clouds and converge onto their focal points, causing implosive compression. Even an isolated cloud suffers from long-distance invasion of waves from remote sources. Echoing SF occurs inside a cloud as well as between clouds. Repetitive refocusing in a filamentary cloud suggests spatial periodicity in SF sites along the filament. The model is applied to the SF regions M16 and M17, where MHD waves produced by M16 are shown to converge onto the focal point of nearby GMC and trigger the SF in M17.

preprint2019arXivOpen access
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