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2003MNRAS.344..188K - Mon. Not. R. Astron. Soc., 344, 188-200 (2003/September-1)
The surface brightness and colour-magnitude relations for Fornax cluster galaxies.
KARICK A.M., DRINKWATER M.J. and GREGG M.D.
Abstract (from CDS):
In this paper, we investigate the surface brightness-magnitude relation for Fornax cluster galaxies. Particular attention is given to the sample of cluster dwarfs and the newly discovered ultracompact dwarf galaxies (UCDs) from the FCSS. We examine the reliability of the surface brightness-magnitude relation as a method for determining cluster membership and find that at surface brightnesses fainter than 22 mag.arcsec–2, it fails in its ability to distinguish between cluster members and barely resolved background galaxies. Cluster members exhibit a strong surface brightness-magnitude relation. Both elliptical (E) galaxies and dwarf elliptical (dE) galaxies increase in surface brightness as luminosity decreases. The UCDs lie off the locus of the relation.
B -V and V -I colours are determined for a sample of 113 cluster galaxies and the colour-magnitude relation is explored for each morphological type. The UCDs lie off the locus of the colour-magnitude relation. Their mean V -I colours (∼1.09) are similar to those of globular clusters associated with NGC 1399. The location of the UCDs on both surface brightness and colour-magnitude plots supports the `galaxy threshing' model for infalling nucleated dwarf elliptical (dE, N) galaxies.
Abstract Copyright: 2003 RAS
Journal keyword(s): methods: observational - galaxies: clusters: individual: Fornax - galaxies: dwarf - galaxies: photometry
VizieR on-line data: <Available at CDS (J/MNRAS/344/188): table3.dat table4.dat>
Nomenclature: Fig.4, Table 4: [DJG2000] UCO N (Nos 6-7) added.
Simbad objects: 201
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