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Mrk 71/NGC 2366 is the closest Green Pea (GP) analog and candidate LymanContinuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detectedthrough direct observations of the ionizing continuum, making this the mostabundant class of confirmed LyC-emitters at any redshift. High resolution,multi-wavelength studies of GPs can lead to an understanding of the method(s),through which LyC escapes from these galaxies. The proximity of Mrk 71/NCG 2366offers unprecedented detail on the inner workings of a GP analog, and enablesus to identify the mechanisms of LyC escape. We use 5825-7650{\AA} integralfield unit PMAS observations to study the kinematics and physical conditions inMrk 71. An electron density map is obtained from the [S II] ratio. A fortuitoussecond order contamination by the [O II]3727 doublet enables the constructionof an electron temperature map. Resolved maps of sound speed, thermalbroadening, "true" velocity dispersion, and Mach number are obtained andcompared to the high resolution magneto-hydrodynamic SILCC simulations. Tworegions of increased velocity dispersion indicative of outflows are detected tothe north and south of the super star cluster, knot B, with redshifted andblueshifted velocities, respectively. We confirm the presence of a faint broadkinematical component, which is seemingly decoupled from the outflow regions,and is fainter and narrower than previously reported in the literature. Withinuncertainties, the low- and high-ionization gas move together. Outside of thecore of Mrk 71, an increase in Mach numbers is detected, implying a decrease ingas density. Simulations suggest this drop in density can be as high as ~4 dex,down to almost optically thin levels, which would imply a non-zero LyC escapefraction along the outflows... [abridged]

An IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366