The Fornax Cluster Spectroscopic Survey: A Sample of Confirmed Cluster Dwarfs

Details The Fornax Cluster Spectroscopic Survey: A Sample of Confirmed Cluster Dwarfs The Fornax Cluster Spectroscopic Survey: A Sample of Confirmed Cluster Dwarfs

2002-06-28

arxiv.org/abs/astro-ph/0206510v1

Mon.Not.Roy.Astron.Soc. 336 (2002) 851

Astronomy and Astrophysics

Astrophysics

17 pages, 9 figures to be published in the Monthly Notices of the Royal Astronomical Society

Scientific paper

10.1046/j.1365-8711.2002.05816.x

The Fornax Cluster Spectroscopic Survey (FCSS) project utilises the 2dF multi-object spectrograph on the AAT. Its aim is to obtain spectra for a complete sample of all 14000 objects with 16.53 arcsec (abut 300 pc). This apparent minimum scale size implies an equivalent minimum luminosity for a dwarf of a given surface brightness. This produces a limit on their distribution in the magnitude-surface brightness plane, such that we do not observe dEs with high surface brightnesses but faint absolute magnitudes. Above this observed minimum scale-size of 3 arcsec, the dEs and dS0s fill the whole area of the magnitude-surface brightness plane sampled by our selection limits. The observed correlation between magnitude and surface brightness noted by several recent studies of brighter galaxies is not seen with our fainter cluster sample. A comparison of our results with the Fornax Cluster Catalog (FCC) of Ferguson illustrates that attempts to determine cluster membership solely on the basis of observed morphology can produce significant errors.

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