Galaxy luminosity evolution: how much is due to a model choice?

Abstract

The cluster and field luminosity functions (LFs) determined on large homogeneous samples (N>2200 galaxies each) are almost indistinguishable, down to M^*+4 in the r and i filters, hence suggesting that the effect of the cluster environment on the galaxy properties does not affect the galaxy luminosity function in red bands. The similarity of the red band LFs in different environments suggests that the galaxy mass function is preserved during the galaxy infall in the cluster. By analyzing a large sample of galaxies in clusters, ideal from many points of view (multicolor data, large size, many clusters, metric magnitudes) we found that luminosity evolution is required by the data but the latter do not unambiguously derive its flavour if a differential luminosity evolution between bright and faint galaxies is allowed. We show that the LF parameters (slope, characteristic magnitude and their evolution) and errors depend on assumptions in a way seldom recognized in literature. We also point out logical inconsistencies between hypothesis assumed in deriving literature LF and presented results, suggesting caution in interpreting similar published results.

A&A, in press

References in corpus (1)

• Galaxy Luminosity Functions from Deep Spectroscopic Samples of Rich Clusters

Cited by in corpus (12)

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• CAIRNS: The Cluster And Infall Region Nearby Survey II. Environmental Dependence of Infrared Mass-to-Light Ratios
• The evolution of the luminosity functions in the FORS Deep Field from low to high redshift: II. The red bands
• Rigorous luminosity function determination in presence of a background: theory and application to two intermediate redshift clusters
• The near-infrared luminosity function of cluster galaxies beyond redshift one
• The buildup of stellar mass and the 3.6 micron luminosity function in clusters from z=1.25 to z=0.2
• K-band Properties of Well-Sampled Groups of Galaxies
• Galaxy evolution in clusters up to z=1.0
• The evolution of the cluster optical galaxy luminosity function between z=0.4 and 0.9 in the DAFT/FADA survey