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http://hdl.handle.net/20.500.12386/33152
Titolo: | Photometry of distant clusters of galaxies : evolutionary features in the cluster 2158+0351 (z = 0.45) | Autori: | MOLINARI, Emilio Carlo BUZZONI, Alberto Chincarini, G. |
Data pubblicazione: | 1990 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 246 | Da pagina:: | 576 | Abstract: | Results of detailed three-colour photometry of the distant cluster 21 58 + 035 (z = 0.445) are presented. A photometric catalogue has been produced using the INVENTORY package, for which we give an estimate of completeness and photometry errors. In total we measured Gunn g, r, i magnitudes for 294 objects, down to r = 23.5, with a typical error of 0.1 mag. On the basis of a statistical analysis, about 60 per cent of these are suggested to be cluster members. Luminosity functions ar shown along with colour-magnitude and two-colour diagrams. We find that the bright- cluster galaxy population is dominated by ellipticals, while a population of spirals becomes relevant at the faint luminosities. Such an overabundance of faint spiral leads us to calculate a high fraction of blue objects, according to the Butcher-Oemler effect. We find f_B_ = 0.3 +/- 0.13. We evidence possible photometric effects on magnitudes and colours due to galactic evolution. In particular, elliptical galaxies in the cluster are recognized to be bluer than present-day descendants, and the first-rank galaxy is intrinsically brighter by about 0.8 mag. An independent estimate of the redshift of the cluster, through photometric properties of its galaxy population, - attempted, deriving z = 0.44 +/- 0.05. This is obtained taking into account appropriate evolutionary k-corrections from population-synthesis models. The importance of such a correction when studying high redshift (young) galaxies is stressed. | URI: | http://hdl.handle.net/20.500.12386/33152 | URL: | https://ui.adsabs.harvard.edu/abs/1990MNRAS.246..576M/abstract | ISSN: | 0035-8711 | Bibcode ADS: | 1990MNRAS.246..576M | Fulltext: | open |
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