EDP Sciences
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Volume 397, Number 2, January II 2003
Page(s) 421 - 430
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20021553

A&A 397, 421-430 (2003)
DOI: 10.1051/0004-6361:20021553

The r'-band luminosity function of Abell 1367: A comparison with Coma

J. Iglesias-Páramo1, A. Boselli1, G. Gavazzi2, L. Cortese2 and J. M. Vílchez3

1  Laboratoire d'Astrophysique de Marseille, BP8, Traverse du Siphon, 13376 Marseille, France
    e-mail: jorge.iglesias@astrsp-mrs.fr,alessandro.boselli@astrsp-mrs.fr
2  Universitá degli Studi di Milano, Bicocca, Piazza delle Scienze, 3, 20126 Milano, Italy
    e-mail: gavazzi@mib.infn.it,luca.cortese@mib.infn.it
3  Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18080 Granada, Spain
    e-mail: jvm@iaa.es

(Received 4 June 2002 / Accepted 10 October 2002 )

We made a large (approximately $1\degr \times 1\degr$) r'-band imaging survey of the central regions of the two nearby clusters of galaxies, Abell 1367 and Coma. The data, presented as a catalog, are used to construct the r'-band luminosity function (LF) of galaxies in these two clusters, by subtracting the Yasuda et al. (2001) galaxy counts from our cluster counts. Our Coma luminosity function is consistent with previous determinations, i.e. providing a faint end slope $\alpha = -1.47_{-0.09}^{+0.08}$, significantly steeper than the one we find for Abell 1367 ( $\alpha = -1.07_{-0.16}^{+0.20}$). The counts in Abell 1367 show a relative minimum at $r' \approx 19$, followed by a steep increase faintward. The difference between the two clusters appears significant, given the consistency of the experimental conditions in the two clusters. Whereas for Coma we find a significant increase of the slope of the LF outwards, no such effect is found for Abell 1367.

Key words: atlases -- galaxies: general -- galaxies: clusters: general

Offprint request: J. Iglesias-Páramo, jorge.iglesias@astrsp-mrs.fr

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