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• W1966713042 abstract "We present a detailed analysis of the number count and photometric redshift distribution of faint galaxies in the Hubble Deep Field (HDF), paying special attention to selection effects, including the cosmological dimming of the surface brightness of galaxies, under the observational conditions employed in this field. We find a considerably different result from previous studies that ignore selection effects; these effects should therefore be taken into account in the analysis. We find that the model of pure luminosity evolution (PLE) of galaxies in the Einstein-de Sitter (EdS) universe predicts much smaller counts than those observed at faint magnitude limits, by a factor of more than 10, so that a very strong number evolution of galaxies with η 3-4 must be invoked to reproduce the I814 counts, when parametrized as * (1 + z)η. However, we show that such a strong number evolution under realistic merging processes of galaxies cannot explain the steep slope of the B450 and V606 counts, and it is seriously inconsistent with their photometric redshift distribution. We find that these difficulties still persist in an open universe with Ω0 0.2, and are resolved only when we invoke a Λ-dominated flat universe, after examining various systematic uncertainties in modeling the formation and evolution of galaxies. The present analysis revitalizes the practice of using faint number counts as an important cosmological test, giving one of the arguments against the EdS universe, and suggests acceleration of the cosmic expansion by vacuum energy density. While a modest number evolution of galaxies with η 1 is still necessary even in a Λ-dominated universe, a stronger number evolution with η > 1 is rejected from the HDF data, giving a strong constraint on the merger history of galaxies." @default.
• W1966713042 created "2016-06-24" @default.
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• W1966713042 date "2000-09-01" @default.
• W1966713042 modified "2023-09-23" @default.
• W1966713042 title "Unavoidable Selection Effects in the Analysis of Faint Galaxies in the Hubble Deep Field: Probing the Cosmology and Merger History of Galaxies" @default.
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• W1966713042 doi "https://doi.org/10.1086/309313" @default.
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