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We characterize the evolution of the rest-frame 1500 $\unicode{xC5}$ UVluminosity Function (UVLF) from AstroSat/UVIT F154W and N242W imaging in theGreat Observatories Origins Survey North (GOODS-N) field. With deep FUVobservations, we construct the UVLF for galaxies at z$<0.13$ and subsequentlycharacterize it with a Schechter function fit. The fitted parameters areconsistent with previous determinations. With deep NUV observations, we areable to construct the UVLF in seven redshift bins in the range z $\sim$ 0.8 -0.4, with galaxies identified till $\sim$2 mag fainter than previous surveys,owing to the high angular-resolution of UVIT. The fitted Schechter functionparameters are obtained for these UVLFs. At z $\sim$ 0.8 - 0.7, we also utilizeHubble Space Telescope (HST) F275W observations in the GOODS-N field toconstruct the UVLF in 2 redshift bins, whose fitted Schechter functionparameters are then found to be consistent with that determined from UVIT at z$\sim$ 0.75. We thus probe the variation of the fitted UVLF parameters over z$\sim$ 0.8 - 0.4, a span of $\sim$2.7 Gyr in age. We find that the slope of theSchechter function, $\alpha$, is at its steepest at z $\sim$ 0.65, implyinghighest star-formation at this instant with galaxies being relatively morepassive before and after this time (also confirmed with FUV star-formation ratedeterminations). We infer that this is a short-lived instance of increasedcosmic star-formation even though cosmic star-formation may be winding-downover longer timespan at this redshift range.

The AstroSat UV Deep Field North: Direct determination of the UV Luminosity Function and its evolution from z $\sim$ 0.8-0.4