Voids, Walls and Low Surface Brightness Galaxies

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

Congreso; AAS 221nd Meeting; 2013

We present recent results on the spatial distribution of low surface brightness galaxies within voids and walls, observed in the large scale distribution of galaxies. The study, obtained from an analysis of SDSS data, allows us to examine the behaviour of the abundance of LSBGs and HSBGs at a fixed local density and distinguish the large-scale environment defined by the void geometry. We find a significant decrement, a factor of ˜4, of the relative fraction of blue, active star-forming LSBGs in equal-mass groups at the void walls and the field. This decrement is consistent with an increase of the fraction of blue, active star-forming HSBGs. In contrast, red LSBGs and HSBGs show negligible changes. We argue that these results are consistent with a scenario where LSBGs with blue colours and strong star formation activity at the void walls are fuelled by gas from the expanding void regions, which could lead to LSBG to HSBG transformations.