Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..189i&link_type=abstract
Astronomy and Astrophysics, Vol.182, NO.2/AUG(II), P. 189, 1987
Astronomy and Astrophysics
Astrophysics
6
Scientific paper
B and V photometry is presented for the galaxies in the direction of the two clusters A 777 and A 910. Both are classified by Abell as richness 4 and distance class 6; in the Zwicky scheme they are both classified as compact. Our photometric data support Butcher and Oemler's suggestion that evolution of the blue galaxy population ƒb occurs in compact, concentrated clusters, including an increase of ƒb with increasing redshift. In both clusters, no correlation exists between B - V colour and galaxy density, at variance with the correlation found for nearby clusters. An analysis of the apparent positions of the galaxies shows strong subclustering in both clusters. A significant correlation between luminosity and projected galaxy density is present for A 777, while no correlation is found for A 910; this different behaviour of the two dusters may indicate that the relaxation process is more complete in A 777 than in A 910, A 777 having a higher value of galaxy density than A 910.
Iannicola Giacinto
Kalloghlian A.
Nanni Domenico
Vignato Agostino
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