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Large-scale structures (LSS) out to z $< 3.0$ are measured in the CosmicEvolution Survey (COSMOS) using extremely accurate photometric redshifts(photoz). The Ks-band selected sample (from Ultra-Vista) is comprised of155,954 galaxies. Two techniques -- adaptive smoothing and Voronoi tessellation-- are used to estimate the environmental densities within 127 redshift slices.Approximately 250 statistically significant overdense structures are identifiedout to z $= 3.0$ with shapes varying from elongated filamentary structures tomore circularly symmetric concentrations. We also compare the densities derivedfor COSMOS with those based on semi-analytic predictions for a $\Lambda$CDMsimulation and find excellent overall agreement between the mean densities as afunction of redshift and the range of densities. The galaxy properties (stellarmass, spectral energy distributions (SEDs) and star formation rates (SFRs)) arestrongly correlated with environmental density and redshift, particularly at z$< 1.0 - 1.2$. Classifying the spectral type of each galaxy using therest-frame b-i color (from the photoz SED fitting), we find a strongcorrelation of early type galaxies (E-Sa) with high density environments, whilethe degree of environmental segregation varies systematically with redshift outto z $\sim 1.3$. In the highest density regions, 80% of the galaxies are earlytypes at z=0.2 compared to only 20% at z = 1.5. The SFRs and the star formationtimescales exhibit clear environmental correlations. At z $> 0.8$, the starformation rate density (SFRD) is uniformly distributed over all environmentaldensity percentiles, while at lower redshifts the dominant contribution isshifted to galaxies in lower density environments.

Evolution of Galaxies and their Environments at z = 0.1 to 3 in COSMOS