Biernacka, MonikaFlin, PiotrPanko, Olena O.Панько, Олена ОлексіївнаПанько, Елена Алексеевна2019-05-162019-05-162009The Astrophysical Journalhttps://dspace.onu.edu.ua/handle/123456789/24044Ellipticities for 6188 low-redshift (z < 0.18) poor and rich galaxy structures have been examined along with their evolution using an optical observational base that is statistically complete. The shape of each structure projected on the celestial sphere was determined using the covariance ellipse method. Analysis of the data indicates that structure ellipticity changes with redshift, being smaller for nearby objects and greater for those located further away. Such a change is also described better by quadratic or exponential relations than by a simple linear scheme. It is concluded that between redshifts of z = 0.18 and z = 0 we observe the dynamical evolution of galaxy clusters. Such a change in ellipticity with redshift is expected in ΛCDM models.engalaxiesclustersgeneral – galaxiesevolutionlarge-scale structure of universeArticle