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Title

The dwarf galaxy population in Abell 2218

Author(s)

Pracy, Michael B.;  De Propris, Roberto;  Driver, Simon P.;  Couch, Warrick J.;  Nulsen, Paul E. J.

Abstract

We present results from a deep photometric study of the rich galaxy cluster Abell 2218 (z=0.18) based on archival HST WFPC2 F606W images. These have been used to derive the luminosity function to extremely faint limits (M_{F606W}=-13.2 mag, mu_{0}=24.7 mag arcsec^{-2}) over a wide field of view (1.3 h^{-2} Mpc^2). We find the faint-end slope of the luminosity function to vary with environment within the cluster, going from alpha=-1.23\pm0.13 within the projected central core of the cluster (100 < r < 300 h^{-1} kpc) to alpha=-1.49\pm 0.06 outside this radius (300 < r < 750 h^{-1} kpc). We infer that the core is 'dwarf depleted', and further quantify this by studying the ratio of 'dwarf' to 'giant' galaxies and its dependency as a function of cluster-centric radius and local galaxy density. We find that this ratio varies strongly with both quantities, and that the dwarf galaxy population in A2218 has a more extended distribution than the giant galaxy population.

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 352, no. 4 (Aug 2004), pp. 1135-1144

Publication year

2004

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Abell 2218;  Dwarf;  Galaxies;  Luminosity function;  Mass function

Publisher

Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1365-2966.2004.08008.x

Copyright

Copyright © 2004 Royal Astronomical Society. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Full text

Peer reviewed