Journal
ASTRONOMY & ASTROPHYSICS
Volume 439, Issue 1, Pages 45-58Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042347
Keywords
large-scale structure of Universe; galaxies : clusters : general; dark matter
Categories
Ask authors/readers for more resources
We find groups and clusters of galaxies using the Data Releases DR1 and DR3 of the Sloan Digital Sky Survey. We calculate a low-resolution density field with a smoothing length of 10 h(-1) Mpc to characterise the density of the cluster environment, and a medium-resolution density field with a smoothing length of 2 h(-1) Mpc to characterise the galaxy environment. We determine the luminosity function of clusters, and investigate properties of galaxies and clusters in various environments. We show that clusters in a high-density environment are about 5 times more luminous than in a low-density environment, and luminosities of galaxies in different environments differ by a factor of similar to 25. We see similar effects in numerical simulations - simulated clusters in a high-density environment are similar to 100 times more massive than those in a low-density environment. Comparison of the density distribution in simulations at various epochs shows that in large low-density regions ( voids) dynamical evolution is very slow and stops early. In contrast, in large regions of higher density (superclusters) dynamical evolution starts early and continues until the present; here particles cluster early, and by merging of smaller groups very rich systems of galaxies form.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available