Pair Analysis of Field Galaxies from the RCS

Details Pair Analysis of Field Galaxies from the RCS Pair Analysis of Field Galaxies from the RCS

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..300h&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the evolution of the number of close companions of similar luminosities per galaxy (N_c) 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 M_{R_c} ≤ -20. The N_c 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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