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À propos de : Quantitative measure of evolution of bright cluster galaxies at moderate redshifts        

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  • Quantitative measure of evolution of bright cluster galaxies at moderate redshifts
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  • Abstract. Using archival data from the Hubble Space Telescope, we study the quantitative morphological evolution of spectroscopically confirmed bright galaxies in the core regions of nine clusters ranging in redshift from z = 0.31 to 0.84. We use morphological parameters derived from two-dimensional bulge-disc decomposition to study the evolution. We find an increase in the mean bulge-to-total luminosity ratio as the Universe evolves. We also find a corresponding increase in the fraction of early-type galaxies and in the mean Sérsic index. We discuss these results and their implications to physical mechanisms for evolution of galaxy morphology.
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