Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-08
Astronomy and Astrophysics
Astrophysics
To be published in Proc. of the Conference "the New Era of Wide-Field Astronomy", held in Preston (UK), 21-24 August 2000
Scientific paper
By means of wide-field (42x28 arcmin) CCD images of the Coma cluster of galaxies and of control fields, taken at the Canada-France-Hawaii telescope with the CFH12K and UH8K cameras, we determine the luminosity function bi-variate in central brightness. We found a clear progression for a steeping and weakening of the FL going from high surface brightness galaxies (mu~20$ mag/arcsec2) to galaxies of very-faint central brightnesses (mu 24.5 mag/arcsec2). Compact galaxies, usually rejected in the star/galaxy classification, are found to be a minor population in Coma. A huge population of low surface brightness galaxies red and faint are discovered, representing the largest contributor to the LF at faint magnitudes. Among them, there could be the remnant of high redshift starbursting galaxies responsible for the Butcher-Oemler effect.
Andreon Stefano
Cuillandre Jean Charles
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