Deprojection of luminosity functions of galaxies in the Coma cluster

Free access article

Issue		A&A Volume 390, Number 3, August II 2002


Page(s)		817 - 820
Section		Cosmology
DOI		http://dx.doi.org/10.1051/0004-6361:20020764

A&A 390, 817-820 (2002)
DOI: 10.1051/0004-6361:20020764

Research Note

Deprojection of luminosity functions of galaxies in the Coma cluster

M. Beijersbergen, W. E. Schaap and J. M. van der Hulst

Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands

(Received 7 February 2002 / Accepted 15 May 2002 )

Abstract
We use a simple analytic model to deproject 2-d luminosity functions (LF) of galaxies in the Coma cluster measured by Beijersbergen et al. 2002. We demonstrate that the shapes of the LFs change after deprojection. It is therefore essential to correct LFs for projection effects. The deprojected LFs of the central area have best-fitting Schechter parameters of M^*_U=-18.31^+0.08_-0.08 and $\alpha_{U}=-1.27^{+0.018}_{-0.018}$ , M^*_B=-19.79^+0.14_-0.15 and $\alpha_{B}=-1.44^{+0.016}_{-0.016}$ and M^*_r=-21.77^+0.20_-0.28 and $\alpha_{r}=-1.27^{+0.012}_{-0.012}$ . The corrections are not significant enough to change the previously observed trend of increasing faint end slopes with increasing distance to the cluster center. The weighted U, B, and r band slopes of the deprojected LFs show a slightly weaker steepening with increasing projected cluster radius.

Key words: galaxies: clusters: individual: Coma (A1656) -- galaxies: luminosity function -- galaxies: evolution -- galaxies: formation

Offprint request: M. Beijersbergen, beijersb@astro.rug.nl

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