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We present UV luminosity functions (LFs) at 1500 Angstrom derived from theHST Early Release Science WFC3/UVIS data acquired over ~50 arcmin^2 of theGOODS-South field. The LFs are determined over the entire redshift rangez=0.75-2.5 using two methods, similar to those used at higher redshifts forLyman Break Galaxies (LBGs): (1) 13-band UV+optical+NIR photometric redshiftsto study galaxies in the range z=0.5-2 in three bins of dz=0.5, and (2) dropoutsamples in three redshift windows centered at z~1.5, z~1.9, and z~2.5. Thecharacteristic luminosity dims by ~1.5 mag from z=2.5 to z=0.75, consistentwith earlier work. However, the other Schechter function parameters, thefaint-end slope and the number density, are found to be remarkably constantover the range z=0.75-2.5. Using these LF determinations we find the UVluminosity density to increase by ~1.4 dex according to (1+z)^{2.58+-0.15} fromz~0 to its peak at z~2.5. Strikingly, the inferred faint-end slopes for our LFsare all steeper than alpha=-1.5, in agreement with higher-redshift LBG studies.Since the faint-end slope in the local universe is found to be much flatterwith alpha~=-1.2, this poses the question as to when and how the expectedflattening occurs. Despite relatively large uncertainties, our data suggestalpha~=-1.7 at least down to z~1. These new results from such a shallow earlydataset demonstrate very clearly the remarkable potential of WFC3/UVIS for thethorough characterization of galaxy evolution over the full redshift rangez~0.5 to z~3.

The Evolution of the UV Luminosity Function from z ~ 0.75 to z ~ 2.5 using HST ERS WFC3/UVIS Observations