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We present the analysis of photometric, spectroscopic, and morphologicalproperties for differently selected samples of passive galaxies up to z=1extracted from the zCOSMOS-20k spectroscopic survey. This analysis intends toexplore the dependence of galaxy properties on the selection criterion adopted,study the degree of contamination due to star-forming outliers, and provide acomparison between different commonly used selection criteria. We extractedfrom the zCOSMOS-20k catalog six different samples of passive galaxies, basedon morphology, optical colors, specific star-formation rate, a best fit to theobserved spectral energy distribution, and a criterion that combinesmorphological, spectroscopic, and photometric information. The morphologicalsample has the higher percentage of contamination in colors, specific starformation rate and presence of emission lines, while the red & passive ETGssample is the purest, with properties mostly compatible with no star formationactivity; however, it is also the less economic criterion in terms ofinformation used. The best performing among the other criteria are the red SEDand the quiescent ones, providing a percentage of contamination only slightlyhigher than the red & passive ETGs criterion (on average of a factor of ~2) butwith absolute values of the properties of contaminants still compatible with ared, passively evolving population. We also provided two revised definitions ofearly type galaxies based on restframe color-color and color-mass criteria,that better reproduce the observed bimodalities. The analysis of the numberdensities shows evidences of mass-assembly downsizing, with galaxies at10.25<log(M/Msun)<10.75 increasing their number by a factor ~2-4 from z=0.6 toz=0.2, by a factor ~2-3 from z=1 to z=0.2 at 10.75<log(M/Msun)<11, and by only~10-50% from z=1 to z=0.2 at 11<log(M/Msun)<11.5.

Spot the difference. Impact of different selection criteria on observed properties of passive galaxies in zCOSMOS 20-k sample