The Evolution of Low-Redshift Galaxy Structures
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Дата
2009
Науковий керівник
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Анотація
Ellipticities 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.
Опис
Ключові слова
galaxies, clusters, general – galaxies, evolution, large-scale structure of universe
Бібліографічний опис
The Astrophysical Journal