Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-03
Astronomy and Astrophysics
Astrophysics
20 pages including 10 of tables, plus 7 figures; To appear in the Astronomical Jorurnal
Scientific paper
10.1086/339305
We have analysed images of the field of A2390 obtained with the CFHT and HST. The analysis fits models to bulge and disk components to several hundred galaxies, with about equal samples from the cluster and field. We also have assessed and graded asymmetries in the images. The cluster galaxies are compared in different cluster locations and also compared with field galaxies. We find that the central old population galaxies are bulge-dominated, while disk systems have young populations and are found predominantly in the outer cluster. S0 and bulgy disk galaxies are found throughout, but concentrate in regions of substructure. Disks of cluster blue galaxies are generally brighter and smaller than those in the field. We find that the cluster members have a higher proportion of interacting galaxies than the field sample. Interactions in the cluster and in the field, as well as cluster infall, appear to inhibit star-formation in galaxies.
Frenette Danielle
Hutchings John B.
Saintonge Amelie
Schade David
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