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- W2046325489 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. This is the largest sample used for pair evolution analysis, providing data over nine redshift bins with about 17,500 galaxies in each. After applying incompleteness and projection corrections, Nc shows a clear evolution with redshift. 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 separate the sample into two different absolute magnitude bins: -25 ⩽ MRc ⩽ − 21 and -21 < MRc ⩽ − 20, and find that the brighter the absolute magnitude, the smaller the m-value. Furthermore, we study the evolution of the pair fraction for different projected separation bins and different luminosities. We find that the m-value becomes smaller for larger separation, and the pair fraction for the fainter luminosity bin has stronger evolution. We derive the major merger remnant fraction frem = 0.06, which implies that about 6% of galaxies with -25 ⩽ MRc ⩽ − 20 have undergone major mergers since z = 0.8." @default.
- W2046325489 created "2016-06-24" @default.
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- W2046325489 date "2008-08-10" @default.
- W2046325489 modified "2023-10-10" @default.
- W2046325489 title "Pair Analysis of Field Galaxies from the Red‐Sequence Cluster Survey" @default.
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- W2046325489 doi "https://doi.org/10.1086/589140" @default.
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