1995A&A...297..610B -
Astronomy and Astrophysics, volume 297, 610-616 (1995/5-3)
On the galaxy luminosity function in the central regions of the Coma cluster.
BIVIANO A., DURRET F., GERBAL D., LE FEVRE O., LOBO C., MAZURE A. and SLEZAK E.
Abstract (from CDS):
We have obtained new redshifts for 265 objects in the central 48x25arcmin
2 region of the Coma cluster. When supplemented with literature data, our redshift sample is 95% complete up to a magnitude b
26.5=18.0 (the magnitudes are taken from the photometric sample of Godwin et al.
1983MNRAS.202..113G). Using redshift-confirmed membership for 205 galaxies, and the location in the colour-magnitude diagram for another 91 galaxies, we have built a sample of cluster members which is complete up to b
26.5=20.0. We show that the Coma cluster luminosity function cannot be adequately fitted by a single Schechter (
1976ApJ...203..297S) function, because of a dip in the magnitude distribution at b
26.5∼17. The superposition of an Erlang (or a Gauss) and a Schechter function provides a significantly better fit. We compare the luminosity function of Coma to those of other clusters, and of the field. Luminosity functions for rich clusters look similar, with a maximum at M
b≃-19.5+5xlogh
50, while the Virgo and the field luminosity functions show a nearly monotonic behaviour. These differences may be produced by physical processes related to the environment which affect the luminosities of a certain class of cluster galaxies.
Abstract Copyright:
∼
Journal keyword(s):
galaxies: clusters: individual: Coma (ACO 1656) - galaxies: clusters of - galaxies: luminosity function
Simbad objects:
5
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