G22 is a hub-filament system composed of four supercritical filaments. Velocity gradients are detected along three filaments. A total mass infall rate of 440 M Myr −1 would double the hub mass in about six free-fall times. The most massive clump C1 would be in global collapse with an infall velocity of 0.31 km s −1 and a mass infall rate of 7.2 × 10 −4 M yr −1 , which is supported by the prevalent HCO + (3-2) and 13 CO (3-2) blue profiles. A hot molecular core (SMA1) was revealed in C1. At the SMA1 center, th…
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