Large Structures and Galaxy Evolution in COSMOS at z < 1.1

Abstract

We present the first identification of large-scale structures (LSS) at z $<1.1$ in the Cosmic Evolution Survey (COSMOS). The structures are identified from adaptive smoothing of galaxy counts in the pseudo-3d space ($\alpha ,\delta$,z) using the COSMOS photometric redshift catalog. The technique is tested on a simulation including galaxies distributed in model clusters and a field galaxy population -- recovering structures on all scales from 1 to 20\arcmin without {\it a priori} assumptions for the structure size or density profile. Our procedure makes {\bf no} {\it a priori} selection on galaxy spectral energy distribution (SED, for example the Red Sequence), enabling an unbiased investigation of environmental effects on galaxy evolution. The COSMOS photometric redshift catalog yields a sample of $1.5\times 10^5$ galaxies with redshift accuracy, $\Delta z_{FWHM}/(1+z)\le 0.1$ at z $<1.1$ down to I${}_{AB}\le 25$ mag. Using this sample of galaxies, we identify 42 large-scale structures and clusters. abstract truncated for astroph 25 line limit -- see preprint

72 pages with 29 pages of figures, for cosmos apj suppl special issue

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