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In this letter we present evidence of coherent outward motion of a sample ofyoung stars ($t<$30 Myr) in the Perseus Arm, whose apparent origin is locatedin the vicinity of the W3/W4/W5 complex. Using astrometric and photometric datafrom the Gaia DR2 catalog of an 8$^\circ$ radius field centered near W4, weselected a sample of young, intermediate to high-mass star candidates. Thesample is limited to sources with parallax uncertainties below 20% and Bayesiandistance estimates within 1800 and 3100 pc. The selection includes embeddedstellar populations as well as young open clusters. Projected velocitiesderived from perspective-corrected proper motions clearly suggest that theyoung star population emerge from the Perseus arm, with a possible convergencezone near W3/W4/W5 region, tracing a front that expands away at a rate of about$15~{\rm km~s}^{-1}~{\rm kpc}^{-1}$.

Evidence of Hubble flow-like motion of young stellar populations away from the Perseus arm