Aims. We intend to compile a new galaxy group and cluster sample of the latest available
SDSS data, adding several parameter for the purpose of studying the supercluster network,
galaxy and group evolution, and their connection to the surrounding environment. Methods …

We have constructed a set of supercluster catalogues for the galaxies from the SDSS survey
main and luminous red galaxy (LRG) flux-limited samples. To delineate superclusters, we
calculated luminosity density fields using the B 3-spline kernel of the radius of 8 h-1 Mpc for …

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 …

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≤ …

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 …

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 …

Context. The study of the properties of galaxy clusters and their environment gives us
information about the formation and evolution of galaxies, groups and clusters, and larger
structures–superclusters of galaxies and the whole cosmic web. Aims. We study the …

Context. To understand the formation, evolution, and present-day properties of the cosmic
web we need to study it at low and high redshifts. Aims. We trace the cosmic web at redshifts
that range from 1.0≤ z≤ 1.8 by using the quasar (QSO) data from the SDSS DR7 QSO …

Context. For the first time, spectroscopic galaxy redshift surveys are enabling galaxies to be
studied with the nearest quasars. This allows the dependence of the activity of a quasar on
its environment to be studied in a more extensive way than before. Aims. We study the …