The surface brightness and colour-magnitude relations for Fornax cluster galaxies

Karick, A. M., Drinkwater, M. J. and Gregg, M. D. (2003) The surface brightness and colour-magnitude relations for Fornax cluster galaxies. Monthly Notices of The Royal Astronomical Society, 344 1: 188-200. doi:10.1046/j.1365-8711.2003.06813.x

Author Karick, A. M.
Drinkwater, M. J.
Gregg, M. D.
Title The surface brightness and colour-magnitude relations for Fornax cluster galaxies
Journal name Monthly Notices of The Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2003-09-01
Year available 2003
Sub-type Article (original research)
DOI 10.1046/j.1365-8711.2003.06813.x
Open Access Status DOI
Volume 344
Issue 1
Start page 188
End page 200
Total pages 13
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We present BVI photometry of 190 galaxies in the central 4 x 3 deg(2) region of the Fornax cluster observed with the Michigan Curtis Schmidt Telescope. Results from the Fornax Cluster Spectroscopic Survey (FCSS) and the Flair-II Fornax Surveys have been used to confirm the membership status of galaxies in the Fornax Cluster Catalogue (FCC). In our catalogue of 213 member galaxies, 92 (43 per cent) have confirmed radial velocities. 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 (similar to1.09) 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.
Keyword Methods
Dwarf Elliptic Galaxies
Spectroscopic Survey
Virgo Cluster
Photometric Properties
Luminosity Function
Central Region
Astronomy & Astrophysics
Methods : Observational
Galaxies : Clusters : Individual : Fornax
Galaxies : Dwarf
Galaxies : Photometry
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 12:20:42 EST