Studying the Patterns of the Universe

Baltic astronomy

article

T. Sepp¹  E. Tempel¹  M. Gramann¹  P. Nurmi³  M. Haupt⁴ 

[1] Tartu Observatory;Institute of Physics, University of Tartu;University of Turku;Institut f¨ur Physik und Astronomie

关键词: galaxies;    groups;    clusters cosmology;    dark matter;    large scale structure of the Universe;   

DOI  :  10.1515/astro-2017-0298

来源: Institute of Theoretical Physics and Astronomy

【 摘 要 】

The SDSS galaxy catalog is one of the best databases for galaxy distribution studies. The SDSS DR8 data is used to construct the galaxy cluster catalog. We construct the clusters from the calculated luminosity density field and identify denser regions. Around these peak regions we construct galaxy clusters. Another interesting question in cosmology is how observable galaxy structures are connected to underlying dark matter distribution. To study this we compare the SDSS DR7 galaxy group catalog with galaxy groups obtained from the semi-analytical Millennium N-Body simulation. Specifically, we compare the group richness, virial radius, maximum separation and velocity dispersion distributions and find a relatively good agreement between the mock catalog and observations. This strongly supports the idea that the dark matter distribution and galaxies in the semi-analytical models and observations are very closely linked.

【 授权许可】

Unknown