  Blue Compact Dwarfs (BCDs) are low-luminosity (M$_{K} > -21$ mag), metal-poor
($\frac{1}{50}$ $\le Z/Z_{\odot} \le\frac{1}{2}$), centrally concentrated
galaxies with bright clumps of star-formation. Cosmological surface brightness
dimming and small size limit their detection at high redshifts, making their
formation process difficult to observe. Observations of BCDs are needed at
intermediate redshifts, where they are still young enough to show their
formative stages, particularly in the outer regions where cosmic gas accretion
should drive evolution. Here, we report the discovery of excess far-ultraviolet
(FUV) emission in the outer regions of 11 BCDs in the GOODS-South field at
redshifts between 0.1 and 0.24, corresponding to look back times of 1.3 - 2.8
Gyr in standard cosmology. These observations were made by the Ultra-Violet
Imaging Telescope (UVIT) on AstroSat. For ten BCDs, the radial profiles of
intrinsic FUV emission, corrected for the instrument point spread function,
have larger scale-lengths than their optical counterparts observed with the
Hubble Space Telescope. Such shallow FUV profiles suggest extended
star-formation in cosmically accreting disks. Clumpy structure in the FUV also
suggests the outer FUV disks are gravitationally unstable. Dynamical friction
on the clumps drives them inward at an average rate exceeding
$10^6~M_{\odot}$Gyr$^{-1}$.
