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The goal of this work is to study the evolution of high-redshift (z 1.4) quiescent galaxies over an effective area of 1.7 deg 2 in the COSMOS field. Galaxies have been divided according to their star formation activity and the evolution of the different populations, in particular of the quiescent galaxies, has been investigated in detail. We have studied an IRAC (mag 3.6 m < 22.0) selected sample of 18 000 galaxies at z 1.4 in the COSMOS field with multiwavelength coverage extending from the U band to the Spitzer 24 m one. We have derived accurate photometric redshifts ( z/(1+z s ) = 0.06) through a SED-fitting procedure. Other important physical parameters masses, ages and star formation rates (SFR) of the galaxies have been obtained using Maraston models. We have divided our sample into actively star-forming, intermediate and quiescent galaxies depending on their specific star formation
Sánchez et al. (Thu,) studied this question.
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