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The luminosity function of galaxies in the Hercules cluster

Published online by Cambridge University Press:  06 October 2004

R. Sánchez-Janssen
Affiliation:
Instituto de Astrofísica de Canarias, Spain email: ruben@ll.iac.es
J. Iglesias-Páramo
Affiliation:
Laboratoire d'Astrophysique de Marseille, France
C. Muñoz-Tuñón
Affiliation:
Instituto de Astrofísica de Canarias, Spain email: ruben@ll.iac.es
J. A. L. Aguerri
Affiliation:
Instituto de Astrofísica de Canarias, Spain email: ruben@ll.iac.es
J. M. Vílchez
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Spain
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Abstract

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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 (Schechter 1976) 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 the LFs of the two subclusters present are consistent with each other and with the global one, the southernmost one exhibits a somewhat steeper faint-end slope.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union