TY  - JOUR
A1  - Sepp, T.
A1  - Tempel, E.
A1  - Gramann, M.
A1  - Nurmi, P.
A1  - Haupt, Michael
T1  - Studying the patterns of the universe
JF  - Baltic astronomy
N2  - 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.
KW  - galaxies: groups, clusters
KW  - cosmology: dark matter, large-scale structure of the Universe
Y1  - 2011
SN  - 1392-0049
VL  - 20
IS  - 2
SP  - 309
EP  - 312
PB  - Institute of Theoretical Physics and Astronomy
CY  - Moletai
ER  -