Query : 2012A&A...540A.106T

2012A&A...540A.106T - Astronomy and Astrophysics, volume 540A, 106-106 (2012/4-1)

Groups and clusters of galaxies in the SDSS DR8. Value-added catalogues.


Abstract (from CDS):

We intend to compile a new galaxy group and cluster sample of the latest available SDSS data, adding several parameter for the purpose of studying the supercluster network, galaxy and group evolution, and their connection to the surrounding environment. We used a modified friends-of-friends (FoF) method with a variable linking length in the transverse and radial directions to eliminate selection effects and to find reliably as many groups as possible. Using the galaxies as a basis, we calculated the luminosity density field. We create a new catalogue of groups and clusters for the SDSS data release 8 sample. We find and add environmental parameters to our catalogue, together with other galaxy parameters (e.g., morphology), missing from our previous catalogues. We take into account various selection effects caused by a magnitude limited galaxy sample. Our final sample contains 576493 galaxies and 77858 groups.

Abstract Copyright:

Journal keyword(s): catalogs - galaxies: clusters: general - galaxies: groups: general - galaxies: statistics - large-scale structure of Universe - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/540/A106): dr8gal.dat dr8gr.dat>

Nomenclature: dr8gr: [TTL2012] NNNNN (Nos 1-77858).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 0

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