What is it about?
We analysed the distribution of mass and dynamical state of galaxy superclusters in the richest known supercluster complex, the BOSS Great Wall at the distance of about 4 billion light years, consisting of four rich superclusters. Our analysis revealed that the BOSS Great Wall superclusters contain eight high-density cores which will collapse during the future evolution, and, as the Universe expands, will form separate superclusters, similar to those as in our local cosmic neighbourhood.
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Why is it important?
Extreme objects such as the BOSS Great Wall usually provide constraints for theories. It is not clear whether systems with sizes, richness, and morphologies similar to those as the BOSS Great Wall can be reproduced in the standard Lambda Cold Dark Matter CDM model. This makes galaxy superclusters at different redshifts unique objects with regard to studies of the formation and evolution of the cosmic web and testing cosmological models and the cosmological principle of homogeneity and isotropy of the Universe. Our study showed that the BOSS Grea Wall superclusters will eventually split to systems with masses and sizes comparable to those of local rich superclusters. This weakens the tension with current cosmological model, which does not predict a large number of rich superclusters in our local cosmic neighbourhood. However, it is also not clear why there are no such very rich supercluster complexes with very elongated systems in the local Universe.
Perspectives
During future evolution the BOSS Great Wall superclusters break into smaller systems, similar to the richest local superclusters such as the Shapley or the Corona Borealis superclusters or the superclusters in the Sloan Great Wall. However, this process is very slow, and it takes many tens of billions years before this happens. Therefore, it is not clear why there is no such superclusters complexes as the BOSS Great Wall in our cosmic neighbourhood. This makes the study of galaxy superclusters very exciting, as it may help to constrain the current cosmological model.
Dr Maret Einasto
Tartu Observatory
Read the Original
This page is a summary of: The evolution of high-density cores of the BOSS Great Wall superclusters, Astronomy and Astrophysics, October 2022, EDP Sciences,
DOI: 10.1051/0004-6361/202142938.
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