Photometric redshifts as a tool to study the Coma cluster galaxy populations

Abstract

We investigate the Coma cluster galaxy luminosity function (GLF) at faint magnitudes, in particular in the u* band by applying photometric redshift techniques applied to deep u*, B, V, R, I images covering a region of ~1deg2 (R 24). Global and local GLFs in the B, V, R and I bands obtained with photometric redshift selection are consistent with our previous results based on a statistical background subtraction. In the area covered only by the u* image, the GLF was also derived after applying a statistical background subtraction. The GLF in the u* band shows an increase of the faint end slope towards the outer regions of the cluster (from alpha~1 in the cluster center to alpha~2 in the cluster periphery). This could be explained assuming a short burst of star formation in these galaxies when entering the cluster. The analysis of the multicolor type spatial distribution reveals that late type galaxies are distributed in clumps in the cluster outskirts, where X-ray substructures are also detected and where the GLF in the u* band is steeper.

14 pages, 2 figures in jpeg format, accepted in A&A

References in corpus (8)

• The strong transformation of spiral galaxies infalling into massive clusters at z~0.2
• The HST/ACS Coma Cluster Survey: I - Survey Objectives and Design
• On the luminosity function of galaxies in groups in the Sloan Digital Sky Survey
• Deep and wide field imaging of the Coma cluster: the data
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Cited by in corpus (4)

• The DAFT/FADA survey. I.Photometric redshifts along lines of sight to clusters in the z=[0.4,0.9] interval
• The evolution of the cluster optical galaxy luminosity function between z=0.4 and 0.9 in the DAFT/FADA survey
• Galaxy Clusters in the IRAC Dark Field II: Mid-IR Sources
• On the nature of faint Low Surface Brightness galaxies in the Coma cluster