The luminosity function of galaxies to $M_{BgVriz}\sim -14$ in $z\sim 0.3$ clusters

Abstract

We present deep composite luminosity functions in $B$, $g$, $V$, $r$, $i$ and $z$ for six clusters at $0.14<z<0.40$ observed with the Hubble Space Telescope Advanced Camera for Surveys. The luminosity functions reach to absolute magnitude of $\sim -14+5\log h$ mag. and are well fitted by a single Schechter function with $M_{BgVriz}^{\ast }=-19.8,-20.9-21.9,-22.0,-21.7,-22.3$ mag. and $\alpha \sim -1.3$ (in all bands). The observations suggest that the galaxy luminosity function is dominated by objects on the red sequence to at least 6 mags. below the $L^{\ast }$ point. Comparison with local data shows that the red sequence is well established at least at $z\sim 0.3$ down to $\sim 1/600^{th}$ of the luminosity of the Milky Way and that galaxies down to the regime of dwarf spheroidals have been completely assembled in clusters at this redshift. We do not detect a steepening of the luminosity function at $M>-16$ as is observed locally. If the faint end upturn is real, the steepening of the luminosity function must be due to a newly infalling population of faint dwarf galaxies.

Accepted by AJ. Only a selection of figures shown in paper: extra figures to be made available on the AJ web site. Email R. De Propris for them in the meantime. Fig. 1 could not be compressed to arXiv size limits. See note in caption for how to obtain it

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