Paper:	Pair Analysis of Field Galaxies from the RCS
Volume:	399, Panoramic Views of Galaxy Formation and Evolution
Page:	300
Authors:	Hsieh, B.C.; Yee, H.K.C.; Lin, H.; Gladders, M.D.; Gilbank, D.G.
Abstract:	We study the evolution of the number of close companions of similar luminosities per galaxy (Nc) by choosing a volume-limited subset of the photometric redshift catalog from the Red-Sequence Cluster Survey (RCS-1). The sample contains over 157,000 objects with a moderate redshift range of 0.25 ≤ z ≤ 0.8 and MRc ≤ −20. The Nc value for the whole sample grows with redshift as (1 + z)m, where m = 2.83 ± 0.33 in good agreement with N-body simulations in a ΛCDM cosmology. We also find that the m value becomes smaller for larger separation, and the pair fraction for the fainter luminosity bin has stronger evolution.

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