Emission-line Wings Driven by Lyman Continuum in the Green Pea Analog Mrk 71

We propose that the origin of faint, broad emission-line wings in Green Pea (GP) analog Mrk 71 is a clumpy, LyC and/or Ly$\alpha$-driven superwind. Our spatially-resolved analysis Gemini-N/GMOS-IFU observations shows these line with terminal velocity $>3000~\rm{km~s^{-1}}$ originate from super star cluster (SSC) Knot A, and propagate to large radii. The object's observed ionization parameter stellar surface density are close their theoretical maxima, radiation pressure dominates over gas pressure. Together lack evidence for supernova feedback, imply radiation-dominated environment. demonstrate radiation-driven superwind A viable model generating extreme velocities, particular, Lyman continuum Ly$\alpha$ opacity must be responsible. find best fitted power laws, as those representative GP luminous blue variable star, albeit different slopes. This suggests they may share common wind-acceleration mechanism. high-velocity, power-law distinctive signature radiatively-driven winds, particular.