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Astron. Astrophys. 342, 408-416 (1999)

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Composite luminosity function of cluster galaxies

Bianca Garilli 1, Dario Maccagni 1 and Stefano Andreon 2

1 Istituto di Fisica Cosmica G. Occhialini, via Bassini 15, I-20133 Milano, Italy (e-mail: bianca,dario@ifctr.mi.cnr.it)
2 Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy (e-mail: andreon@na.astro.it)

Received 16 July 1998 / Accepted 12 November 1998

Abstract

We constructed the composite Luminosity Function (LF) of cluster galaxies in the g, r and i bands from the photometry of a mixed (Abell and X-ray selected) sample of the cores of 65 clusters, ranging in redshift from 0.05 to 0.25. The composite LF has been obtained from complete samples of [FORMULA] galaxies in the magnitude range [FORMULA] (-18 in i). Cluster membership has been determined on the basis of color-color plots for each cluster and the resulting outlier counts have been checked against field counts in the same bands. We find that the galaxy density of the environment determines the shape of the LF, in the sense that bright galaxies are more abundant in dense clusters.

Key words: galaxies: clusters: general – galaxies: luminosity function, mass function

Send offprint requests to: B. Garilli

Correspondence to: Istituto di Fisica Cosmica G. Occhialini, via Bassini 15, I-20133 Milano, Italy

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© European Southern Observatory (ESO) 1999

Online publication: February 22, 1999
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