Investigation of the orientation of galaxies in clusters: the importance, methods and results of research
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Дата
2019
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Анотація
Various models of structure formation can account for various aspects of the
galaxy formation process on different scales, as well as for various observational
features of structures. Thus, the investigation of galaxies orientation constitute a
standard test of galaxies formation scenarios since observed variations in angular
momentum represent fundamental constraints for any model of galaxy formation.
We have improved the method of analysis of the alignment of galaxies in clusters.
Now, the method allows to analyze both position angles of galaxy major axes
and two angles describing the spatial orientation of galaxies. The distributions
of analyzed angles were tested for isotropy by applying different statistical tests.
For sample of analyzed clusters we have computed the mean values of analyzed
statistics, checking whether they are the same as expected ones in the case of
random distribution of analyzed angles. The detailed discussion of this method
has been performed. We have shown how to proceed in many particular cases in
order to improve the statistical reasoning when analyzing the distribution of the
angles in the observational data. Separately, we have compared these new results
with those obtained from numerical simulations. We show how powerful is our
method on the example of galaxy orientation analysis in 247 Abell rich galaxy
clusters. We have found that the orientations of galaxies in analyzed clusters are
not random. It means that we genuinely confirmed an existence of the alignment
of galaxies in rich Abells’ galaxy clusters. This result is independent from the
clusters of Bautz-Morgan types.
Опис
Ключові слова
galaxies, general, galaxy formation
Бібліографічний опис
Journal of Cosmology and Astroparticle Physics