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We study the tidal interaction of galaxies in the Eridanus supergroup, usingHI data from the pre-pilot survey of WALLABY (Widefield ASKAP L-band LegacyAll-sky Blind surveY). We obtain optical photometric measurements and quantifythe strength of tidal perturbation using a tidal parameter $S_{sum}$. Forlow-mass galaxies of $M_* \lesssim 10^9 M_\odot$, we find a dependence ofdecreasing HI-to-optical disk size ratio with increasing $S_{sum}$, but nodependence of HI spectral line asymmetry with $S_{sum}$. This is consistentwith the behavior expected under tidal stripping. We confirm that the colorprofile shape and color gradient depend on the stellar mass, but there isadditional correlation of low-mass galaxies having their color gradients within$2R_{50}$ increasing with higher $S_{sum}$. For these low-mass galaxies, thedependence of color gradients on $S_{sum}$ is driven by color becomingprogressively redder in the inner disk when tidal perturbations are stronger.For high-mass galaxies, there is no dependence of color gradients on $S_{sum}$,and we find a marginal reddening throughout the disks with increasing$S_{sum}$. Our result highlights tidal interaction as an importantenvironmental effect in producing the faint end of the star formationsuppressed sequence in galaxy groups.

WALLABY Pre-Pilot Survey: The effects of tidal interaction on radial distribution of color in galaxies of the Eridanus supergroup