Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-11
Astronomy and Astrophysics
Astrophysics
14 pages, 2 figures in jpeg format, accepted in A&A
Scientific paper
10.1051/0004-6361:200809845
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.
Adami Chris
Cuillandre Jean Charles
Durret Florence
Ilbert Olivier
Mazure Alain
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