The Colors of Bulges and Disks in the Core and Outskirts of Galaxy Clusters

S. Barsanti, M. S. Owers, R. M. McDermid, K. Bekki, J. J. Bryant, S. M. Croom, S. Oh, A. S. G. Robotham, N. Scott, J. van de Sande

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The role of the environment on the formation of S0 galaxies is still not well understood, specifically in the outskirts of galaxy clusters. We study eight low-redshift clusters, analyzing galaxy members up to cluster-centric distances of similar to 2.5 R-200. We perform 2D photometric bulge-disk decomposition in the g, r, and i bands from which we identify 469 double-component galaxies. We separately analyze the colors of the bulges and disks and their dependence on the projected cluster-centric distance and local galaxy density. For our sample of cluster S0 galaxies, we find that bulges are redder than their surrounding disks, show a significant color-magnitude trend, and have colors that do not correlate with environment metrics. On the other hand, the disks associated with our cluster S0s become significantly bluer with increasing cluster-centric radius but show no evidence for a color-magnitude relation. The disk color-radius relation is mainly driven by galaxies in the cluster core at 0

Original languageEnglish
Article number21
Number of pages23
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 16 Apr 2021


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