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Large Structures and Galaxy Evolution in COSMOS at z < 1.1

N. Scoville·H. Aussel·A. Benson·A. Blain·D. Calzetti·P. Capak·R. S. Ellis·A. El-Zant·A. Finoguenov·M. Giavalisco·L. Guzzo·G. Hasinger·J. Koda·O. Lefevre·R. Massey·H. J. McCracken·B. Mobasher·A. Renzini·J. Rhodes·M. Salvato·D. B. Sanders·S. S. Sasaki·E. Schinnerer·K. Sheth·P. L. Shopbell·Y. Taniguchi·J. E. Taylor·D. J. Thompson
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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 ($α,δ$,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 $1.5\times10^5$ galaxies with redshift accuracy, $Δz_{FWHM}/(1+z) \leq 0.1$ at z $< 1.1$ down to I$_{AB} \leq 25$ mag. Using this sample of galaxies, we identify 42 large-scale structures and clusters. abstract truncated for astroph 25 line limit -- see preprint

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N. Scoville, H. Aussel, A. Benson, A. Blain, D. Calzetti, P. Capak, R. S. Ellis, A. El-Zant, A. Finoguenov, M. Giavalisco, L. Guzzo, G. Hasinger, J. Koda, O. Lefevre, R. Massey, H. J. McCracken, B. Mobasher, A. Renzini, J. Rhodes, M. Salvato, D. B. Sanders, S. S. Sasaki, E. Schinnerer, K. Sheth, P. L. Shopbell, Y. Taniguchi, J. E. Taylor, D. J. Thompson. 2007-02-20. Large Structures and Galaxy Evolution in COSMOS at z < 1.1. https://doi.org/10.1086/516751

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