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In this work we analyze the physical properties of a sample of 153 starforming galaxies at z~0.84, selected by their H-alpha flux with a NB filter.B-band luminosities of the objects are higher than those of local star forminggalaxies. Most of the galaxies are located in the blue cloud, though someobjects are detected in the green valley and in the red sequence. After theextinction correction is applied virtually all these red galaxies move to theblue sequence, unveiling their dusty nature. A check on the extinction lawreveals that the typical extinction law for local starbursts is well suited forour sample but with E(B-V)_stars=0.55 E(B-V)_gas. We compare star formationrates (SFR) measured with different tracers (H-alpha, UV and IR) finding thatthey agree within a factor of three after extinction correction. We find acorrelation between the ratios SFR_FUV/SFR_H-alpha, SFR_IR/SFR_H-alpha and theEW(H-alpha) (i.e. weighted age) which accounts for part of the scatter. Weobtain stellar mass estimations fitting templates to multi-wavelengthphotometry. The typical stellar mass of a galaxy within our sample is ~10^10Msun. The SFR is correlated with stellar mass and the specific star formationrate (sSFR) decreases with it, indicating that massive galaxies are lessaffected by star formation processes than less massive ones. This result isconsistent with the downsizing scenario. To quantify this downsizing weestimated the quenching mass M_Q for our sample at z~0.84, finding that itdeclines from M_Q ~10^12 Msun to M_Q ~8x10^10 Msun at the local Universe.

Star Formation Rates and Stellar Masses of H-alpha Selected Star-Forming Galaxies at z=0.84: A Quantification of the Downsizing