The Luminosity Function of Galaxies in the Hercules Cluster

Details The Luminosity Function of Galaxies in the Hercules Cluster The Luminosity Function of Galaxies in the Hercules Cluster

2004-04-19

arxiv.org/abs/astro-ph/0404359v1

Astronomy and Astrophysics

Astrophysics

3 pages, to appear in Proc. of IAU Colloq. 195: "Outskirts of Galaxy Clusters: Intense Life in the Suburbs"

Scientific paper

10.1017/S1743921304000936

We have imaged $\sim$ 1 deg$^{2}$ in the V-band in the direction of the Hercules Cluster (Abell 2151). The data are used to compute for the first time the luminosity function (LF) of galaxies in the cluster down to the dwarf regime (M$_{lim}$ $\sim$ -13.85). The global LF is well described by a Schechter function (\cite{schechter76}) with best-fit parameters $\alpha$ = -1.30 $\pm$ 0.06 and M$_V$$^*$ = -21.25 $\pm$ 0.25. The radial dependence of the LF has also been studied, finding that it turns out to be almost constant within the errors even further away than the virial radius. Given the presence of significant substructure within the cluster, we have analized the LFs in different regions. While two of the subclusters present LFs consistent with each other and with the global one, the southernmost one exhibits a somewhat steeper faint-end slope.

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