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19 April 2024 |
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UV Imaging of the Galaxy Cluster CL0939+4713 (Abell 851) at z=0.41 | | Lucio M. Buson
; Francesco Bertola
; Michele Cappellari
; Cesare Chiosi
; Alan Dressler
; Augustus Oemler Jr
; | | Date: |
5 Oct 1999 | | Subject: | astro-ph | | Abstract: | The first UV F300W and F218W WFPC2 observations of the rich galaxy cluster CL0939+4713 at z=0.41 are presented and discussed. UV/optical two-color and c-m diagrams of the sources detected in the F300W waveband are constructed. Thanks to pre-existing HST optical images of the same field a morphological classification for the majority of these objects is also provided. Moreover, taking advantage of recent redshift surveys along CL0939+4713 line of sight, separate diagrams comparing the properties of galaxies belonging to the cluster and to its close projected field are presented. Possible evolutionary effects in the UV from z~0.4 to present time are investigated by comparing the restframe [mid-UV-Optical] colors of galaxies in CL0939+4713 with balloon-borne data of the Coma cluster, as well as by resorting to suitable galaxy evolution models. Finally, current attempts to constrain the epoch of the UV-upturn onset in evolved populations by means of HST UV observations are discussed. | | Source: | arXiv, astro-ph/9910094 | | Services: | Forum | Review | PDF | Favorites | |
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