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SHARDS, an ESO/GTC Large Program, is an ultra-deep (26.5 mag)spectro-photometric survey with GTC/OSIRIS designed to select and study massivepassively evolving galaxies at z=1.0-2.3 in the GOODS-N field using a set of 24medium-band filters (FWHM~17 nm) covering the 500-950 nm spectral range. Ourobserving strategy has been planned to detect, for z>1 sources, the prominentMg absorption feature (at rest-frame ~280 nm), a distinctive, necessary, andsufficient feature of evolved stellar populations (older than 0.5 Gyr). Theseobservations are being used to: (1) derive for the first time an unbiasedsample of high-z quiescent galaxies, which extends to fainter magnitudes thesamples selected with color techniques and spectroscopic surveys; (2) deriveaccurate ages and stellar masses based on robust measurements of spectralfeatures such as the Mg(UV) or D(4000) indices; (3) measure their redshift withan accuracy Delta(z)/(1+z)<0.02; and (4) study emission-line galaxies(starbursts and AGN) up to very high redshifts. The well-sampled optical SEDsprovided by SHARDS for all sources in the GOODS-N field are a valuablecomplement for current and future surveys carried out with other telescopes(e.g., Spitzer, HST, and Herschel).

SHARDS: Survey for High-z Absorption Red & Dead Sources