EDP Sciences
Free Access
Volume 408, Number 1, September II 2003
Page(s) 57 - 65
Section Extragalactic astronomy
DOI https://doi.org/10.1051/0004-6361:20030971
Published online 17 November 2003

A&A 408, 57-65 (2003)
DOI: 10.1051/0004-6361:20030971

Optical luminosity functions of the Abell galaxy cluster ABCG 209 at z = 0.21

A. Mercurio1, M. Massarotti2, P. Merluzzi2, M. Girardi1, F. La Barbera2 and G. Busarello2

1  Dipartimento di Astronomia, Università degli Studi di Trieste, via Tiepolo 11, 34100 Trieste, Italy
    e-mail: mercurio@ts.astro.it; girardi@ts.astro.it
2  INAF - Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy

(Received 27 February 2003 / Accepted 19 June 2003)

We derive the luminosity functions in three bands (BVR) for the rich galaxy cluster ABCG 209 at  z=0.21. The data cover an area of ~78 arcmin 2 in the B and  R bands, while a mosaic of three pointings was obtained in the V band, covering an area of approximately 160 arcmin 2. The galaxy sample is complete to  B = 22.8 ( $N {\rm _{gal}} = 339$), V = 22.5 ( $N{\rm _{gal}} = 1078$) and  R = 22.0 ( $N {\rm _{gal}} = 679$). Although the fit of a single Schechter function cannot be rejected in any band, the luminosity functions are better described by a sum of two Schechter functions for bright and faint galaxies, respectively. There is an indication for a presence of a dip in the luminosity functions in the range V = 20.5-21.5 and R = 20.0-21.0. We find a marked luminosity segregation, in the sense that the number ratio of bright-to-faint galaxies decreases by a factor 4 from the center to outer regions. Our analysis supports the idea that ABCG 209 is an evolved cluster, resulting from the merger of two or more sub-clusters.

Key words: galaxies: clusters: individual: Abell 209 -- galaxies: photometry -- galaxies: luminosity function, mass function

Offprint request: A. Mercurio, mercurio@ts.astro.it

SIMBAD Objects

© ESO 2003

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.