The surface brightness of galaxies in groups at void walls

CECCARELLI, L.; GARCÍA LAMBAS, D.; PADILLA, N.; GALAZ, G.; HERRERA-CAMUS, R.

San Juan

Congreso; 54ª Reunión de la Asociación Argentina de Astronomía; 2011

ICATE

We study the relative fraction of low surface brightness galaxies (LSBGs) in groups at void walls in the SDSS DR7. This analysis allows to exam- ine the behavior of the abundance of these galaxies at a fixed local density but distinguishes the large-scale environment defined by the void geome- try. We find a significant decrement by a factor 4 of the relative fraction of blue LSBGs in groups of a given mass range at the wall edges, that is within a void centric distance around the void radius. This decrement is consistent with an increase of the fraction of blue high surface brightness galaxies (HSBGs). By contrast, red LSBGs and HSBGs have negligible changes. We argue that these results are consistent with a scenario where blue LSBGS at the void walls are fueled by gas from the expanding void regions and by efficiently forming new stars, may undergo LSB onto HSB transformations.