Groups of galaxies in the SDSS Data Release 5. A group-finder and a catalogue
E. Tago, J. Einasto, E. Saar, E. Tempel, M. Einasto, J. Vennik, V., M\"uller

TL;DR
This paper presents a new group-finder algorithm applied to SDSS DR5 data, resulting in a large galaxy group catalogue that accounts for selection effects and enables studies of the supercluster-void network.
Contribution
A modified friends-of-friends method with variable linking length was developed to reliably identify galaxy groups in SDSS DR5, considering selection effects and luminosity-density relations.
Findings
Catalogue contains over 50,000 galaxy groups.
Linking length increases slowly with distance up to z=0.12.
The method allows for large-scale luminosity-density field analysis.
Abstract
We extract groups of galaxies from the SDSS Data Release 5 with the purpose of studying the supercluster-void network and environmental properties of groups therein. We use a modified friends-of-friends (FoF) method with adopted variable linking length in transverse and radial direction to eliminate selection effects and to find reliably as many groups as possible to track the supercluster network. We take into account various selection effects due to the use of a magnitude limited sample. To determine linking length scaling we study the luminosity-density relation in observed groups. We follow the changes in group sizes and mean galaxy number densities within groups when shifting nearby groups to larger distances. As a result we show that the linking length should be a slowly growing function with distance. Our final sample contains 17143 groups in the equatorial, and 33219 groups in…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Remote Sensing in Agriculture · Astronomy and Astrophysical Research
