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We present new results on the kinematics, thermal and ionization state, andspatial distribution of metal-enriched gas in the circumgalactic medium (CGM)of massive galaxies at redshift 3, using the "Eris" suite of cosmological"zoom-in" simulations. The reference run adopts a blastwave scheme forsupernova feedback that produces galactic outflows, a star formation recipebased on a high gas density threshold, metal-dependent radiative cooling, and amodel for the diffusion of metals and thermal energy. Synthetic spectra throughthe multiphase CGM produce interstellar absorption line strengths of Lya, CII,CIV, SiII, and SiIV as a function of galactocentric impact parameter (scaled tothe virial radius) that are in broad agreement with those observed athigh-redshift by Steidel et al. (2010). Only about one third of all the gaswithin R_vir is outflowing. The fraction of sightlines within one virial radiusthat intercept optically thick material is 27%, in agreement with recentobservations by Rudie et al. (2012). Such optically thick absorption is shownto trace inflowing "cold" streams that penetrate deep inside the virial radius.The streams, enriched to metallicities above 0.01 solar, give origin to strong(log N > 13) CII absorption with a covering factor of 22% within R_vir and 10%within 2 R_vir. Galactic outflows do not cause any substantial suppression ofthe cold accretion mode. The central galaxy is surrounded by a large OVI halo,with a typical column density log N>14 and a near unity covering factormaintained all the way out to 150 kpc. This matches the trends recentlyobserved in star-forming galaxies at low redshift by Tumlinson et al. (2011).Our zoom-in simulations of this single system appear to reproducequantitatively the complex baryonic processes that determine the exchange ofmatter, energy, and metals between galaxies and their surroundings. (Abridged)

The circumgalactic medium of massive galaxies at z~3: a test for stellar feedback, galactic outflows, and cold streams