THE CONCEPT OF VOID HIERARCHY AND THE DISTRIBUTION OF GALAXIES IN VOIDS

We present a study of the distribution of faint galaxies, in particula r Blue Compact Dwarf Galaxies (BCG), in voids outlined by bright galax ies. For this purpose we give a void definition and explain our concep tion of void hierarchy, Then we analyse the radial distribution of gal axies inside voids and study the distribution of BCGs with respect to normal galaxies using the nearest neighbour test. Our results show tha t the hierarchy of voids continues to dwarf galaxies. Galaxies in void s defined by brighter galaxies are concentrated to void walls, but a c ertain fraction of them are located also in the central regions of voi ds. The distribution of BCGs is very close to that of other dwarf gala xies. The median distance of BCGs from nearest neighbours is approxima tely 0.7 h(-1) Mpc, which indicates that these galaxies lie in outlyin g parts of systems of galaxies defined by normal galaxies.