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Cluster faint low surface brightness galaxies (fLSBs) are difficult toobserve. Consequently, their origin, physical properties and number density arenot well known. After a first search for fLSBs in the highly substructured Comacluster, we present here a search for fLSBs in Abell 496. This cluster appearsto be much more relaxed than Coma, but is embedded in a large scale filament ofgalaxies. Our aim is to compare the properties of fLSBs in these two verydifferent clusters, to search for environmental effects. Based on deepCFHT/Megacam images in the u*, g', r' and i' bands, we selected galaxies withr'>21 and surface brightness > 24 mag/arcsec-2. We estimated photometricredshifts for all these galaxies and kept the 142 fLSBs with photo-z<0.2. In ag'-i' versus i' color-magnitude diagram, we find that a large part of thesefLSBs follow the red sequence (RS) of brighter galaxies. The fLSBs within+-1sigma of the RS show a homogeneous spatial distribution, while those abovethe RS appear to be concentrated along the large scale filament of galaxies.These properties are interpreted as agreeing with the idea that RS fLSBs areformed in groups prior to cluster assembly. The formation of red fLSBs could berelated to infalling galaxies.

A search for faint low surface brightness galaxies in the relaxed cluster Abell 496