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- W2024177210 abstract "A new algorithm is developed, based on the friends-of-friends (FOF) algorithm, to identify galaxy groups in a galaxy catalog in which the redshift errors have large dispersions (e.g., a photometric redshift galaxy catalog in which a portion of the galaxies also have much more precise spectroscopic redshifts). The DEEP2 mock catalogs, with our additionalsimulated photometric redshift errors, areused totest the performance of ouralgorithm. The association of the reconstructed galaxy groups with the dark halos in the mock catalogs gives an idea about the completeness and purity of the derived group catalog. Our results show that in a 0:6 � z � 1:6 galaxy catalog with an R-band limiting magnitude of 24.1 and an average 1 � photometric redshift error of � 0.03, the overallpurity of our new algorithm for richness 4–7 (line-of-sight velocity dispersion � 300 km s � 1 ) groups is higher than 70% (i.e., 70% of the groups reconstructedbyouralgorithmarerelatedtorealgalaxygroups).Theperformanceof thenewalgorithmiscomparedwith the performance of the FOF algorithm, and it is suggested that this new algorithm is better than FOF for a database, given the same redshift uncertainties. Subject headingg catalogs — galaxies: clusters: general — galaxies: halos — galaxies: high-redshift — galaxies: photometry — methods: data analysis" @default.
- W2024177210 created "2016-06-24" @default.
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- W2024177210 date "2008-07-10" @default.
- W2024177210 modified "2023-10-15" @default.
- W2024177210 title "A New Galaxy Group Finding Algorithm: Probability Friends‐of‐Friends" @default.
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- W2024177210 doi "https://doi.org/10.1086/588183" @default.
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