The richest superclusters : I Morphology

The richest superclusters : I Morphology

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The richest superclusters : I Morphology

Show simple item record Einasto, M. Saar, E. Liivamägi, L.J. Einasto, J. Tago, E. Martínez García, Vicent Josep Starck, J.-L. Müller, V. Heinämäki, P. Nurmi, P. Gramann, M. Hütsi, G. 2010-07-13T08:05:21Z 2010-07-13T08:05:21Z 2007
dc.description.abstract Context.Superclusters are the largest systems in the Universe to give us information about the formation and evolution of structures in the very early Universe. Our present series of papers is devoted to the study of the morphology and internal structure of superclusters of galaxies. Aims. We study the morphology of the richest superclusters from the catalogs of superclusters of galaxies in the 2dF Galaxy Redshift Survey and compare the morphology of real superclusters with model superclusters in the Millennium Simulation. Methods.We use Minkowski functionals and shapefinders to quantify the morphology of superclusters: their sizes, shapes, and clumpiness. We generate empirical models of simple geometry to understand which morphologies correspond to the supercluster shapefinders (Appendix A). Results. Rich superclusters have elongated, filamentary shapes with high-density clumps in their core regions. The clumpiness of superclusters is determined using the fourth Minkowski functional V3. In the K1-K2 shapefinder plane the morphology of superclusters is described by a curve which is characteristic of multi-branching filaments as shown by our empirical models. We found several differences between observed and model superclusters. The curves of the fourth Minkowski functional V3 for observed and model superclusters have different shapes indicating that their structure is different. The values of V3 for the supercluster SCL126 (the Sloan Great Wall) show that this supercluster has a very high density core which is absent in other superclusters. The values of the shapefinders H1-H3 and K1 and K2 for observed superclusters have much larger scatter than for model superclusters. The differences between the fourth Minkowski functional V3 for the bright and faint galaxies in observed superclusters are larger than in simulated superclusters. Conclusions.Our results show how the Minkowski functionals and shapefinders can be used to describe the morphology of superclusters: their shapes, sizes and clumpiness. The shapes of observed superclusters are more diverse than the shapes of simulated superclusters. The larger scatter of the fourth Minkowski functional V3 for the bright and faint galaxies for observed superclusters compared to simulated superclusters is an indication that the clumpiness of bright and faint galaxies in models does not reflect well the clumpiness of different galaxies in observed superclusters. Our results suggest also that the volume covered by the Millennium Simulations may be too small to properly describe the large morphological variety of superclusters. en
dc.language.iso en en
dc.relation en
dc.source EINASTO, M. et al., 2007, The richest superclusters : I Morphology, Astronomy and astrophysics, vol. 476, no. 2, p. 697-711 en
dc.subject Cosmology ; Large-scale structure of Universe ; Galaxies ; Clusters en
dc.title The richest superclusters : I Morphology en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia en
dc.identifier.doi 10.1051/0004-6361:20078037 en
dc.description.private Martinez Garcia, Vicent Josep, en
dc.identifier.idgrec 045211 en

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