Query : 2009A&A...495...37T

2009A&A...495...37T - Astronomy and Astrophysics, volume 495, 37-51 (2009/2-3)

Anatomy of luminosity functions: the 2dFGRS example.


Abstract (from CDS):

We use the 2dF Galaxy Redshift Survey to derive the luminosity function (LF) of the first-ranked (brightest) group/cluster galaxies, the LF of second-ranked, satellite, and isolated galaxies, and the LF of groups of galaxies. We investigate the LFs of different samples in various environments: in voids, filaments, superclusters, and supercluster cores. We compare the derived LFs with the Schechter and double-power-law analytical expressions. We also analyse the luminosities of isolated galaxies. We find a strong environmental dependency by the luminosity functions of all populations. The luminosities of first-ranked galaxies have a lower limit, depending on the global environment (higher in supercluster cores and absent in voids). The LF of second-ranked galaxies in high-density regions is similar to the LF of first-ranked galaxies in a lower density environment. The brightest isolated galaxies can be identified with first-ranked galaxies at distances where the remaining galaxies lie outside the observational window used in the survey. The galaxy and cluster LFs can be approximated by a double-power law. The widely used Schechter function does not describe the bright end and the bend of the LFs well. Properties of the LFs reflect differences in the evolution of galaxies and their groups in different environments.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmology: large-scale structure of universe - galaxies: clusters: general - galaxies: luminosity function, mass function - galaxies: formation

CDS comments: Paragraph. 6.3 NGC 901/902 is a misprint for ACO 901/902.

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11895 1
2 ACO 901 ClG 09 55 56.9256 -10 01 46.519           ~ 105 1
3 ACO 902 ClG 09 56 33.600 -10 09 13.10           ~ 60 1
4 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 557 0
5 [EET2007] N152 SCG 13 06.2 -02 34           ~ 39 0
6 NAME Local Group GrG ~ ~           ~ 7726 0

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