We study the distribution of Abell and X-ray–selected clusters of galaxies and derive
selection functions of these cluster samples. We find that selection functions and percolation
properties of Abell clusters of richness class R= 0 and R≥ 1 are similar; the percolation of X …

We provide flux-and volume-limited galaxy group and cluster catalogues based on the
spectroscopic sample of the galaxies of SDSS data release 10. We used a modified friends-
of-friends method with a variable linking length in the transverse and radial directions to …

Aims. We extract groups of galaxies as flux-limited and volume-limited samples from the
SDSS Data Release 7 (DR7) to study the supercluster-void network and environmental
properties of groups therein. Volume-limited catalogues are particularly useful for a …

Context. Understanding the formation, evolution and present-day properties of the cosmic
web and objects forming it is an important task in cosmology. Aims. We compare the galaxy
populations in superclusters of different morphology in the nearby Universe (180 h-1 Mpc≤ …

Context. The majority of all galaxies reside in groups of fewer than 50 member galaxies.
These groups are distributed in various large-scale environments from voids to
superclusters. Aims. The evolution of galaxies is affected by the environment in which they …

Aims. We study the influence of the environment on the evolution of galaxies by investigating
the luminosity function (LF) of galaxies of different morphological types and colours at
different environmental density levels. Methods. We construct the LFs separately for galaxies …

Context. The study of the signatures of multimodality in groups and clusters of galaxies, an
environment for most of the galaxies in the Universe, gives us information about the
dynamical state of clusters and about merging processes, which affect the formation and …

We have studied the properties of Las Campanas Loose Groups (Tucker et al. 2000) in the
neighbourhood of rich (Abell, APM and X-ray) clusters of galaxies. These loose groups show
strong evidence of segregation measured in terms of the group richness and the group …

Aims. Superclusters are the largest relatively isolated systems in the cosmic web. Using the
SDSS BOSS survey, we search for the largest superclusters in the redshift range 0.43< z<
0.71. Methods. We generate a luminosity-density field smoothed over 8 h-1 Mpc to detect the …

Using the recently determined spatial velocity components of the extreme runaway star HIP
60350 and a gravitation potential model of the Galaxy, we integrate the orbit of HIP 60350
back to the plane of the Galaxy. In this way, a possible location of the formation of the star is …