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In this paper, we present a comprehensive analysis of star-forming galaxies(SFGs) at intermediate redshifts (z~1). We combine the ultra-deep opticalspectro-photometric data from the Survey for High-z Absorption Red and DeadSources (SHARDS) with deep UV-to-FIR observations in the GOODS-N field.Exploiting two of the 25 SHARDS medium-band filters, F687W17 and F823W17, weselect [OII] emission line galaxies at z~0.84 and z~1.23 and characterize theirphysical properties. Their rest-frame equivalent widths(EW$_{\mathrm{rf}}$([OII])), line fluxes, luminosities, star formation rates(SFRs) and dust attenuation properties are investigated. The evolution of theEW$_{\mathrm{rf}}$([OII]) closely follows the SFR density evolution of theuniverse, with a trend of EW$_{\mathrm{rf}}$([OII])$\propto$(1+z)$^3$ up toredshift z~1, followed by a possible flattening. The SF properties of thegalaxies selected on the basis of their [OII] emission are compared withcomplementary samples of SFGs selected by their MIR and FIR emission, and alsowith a general mass-selected sample of galaxies at the same redshifts. Wedemonstrate observationally that the UVJ diagram (or, similarly, a cut in thespecific SFR) is only partially able to distinguish the quiescent galaxies fromthe SFGs. The SFR-M$_*$ relation is investigated for the different samples,yelding a logarithmic slope ~1, in good agreement with previous results. Thedust attenuations derived from different SFR indicators (UV(1600), UV(2800),[OII], IR) are compared and show clear trends with respect to both the stellarmass and total SFR, with more massive and highly star-forming galaxies beingaffected by stronger dust attenuation.

SHARDS: A global view of the star formation activity at z~0.84 and z~1.23