2008A&A...479..335B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.13CEST05:10:31

2008A&A...479..335B - Astronomy and Astrophysics, volume 479, 335-346 (2008/2-4)

The galaxy luminosity function of the Abell 496 cluster and its spatial variations.

BOUE G., ADAMI C., DURRET F., MAMON G.A. and CAYATTE V.

Abstract (from CDS):

The faint end slopes of galaxy luminosity functions (LFs) in clusters of galaxies have been observed in some cases to vary with clustercentric distance and should be influenced by the physical processes (mergers, tides) affecting cluster galaxies. However, there is a wide disagreement on the values of the faint end LF slopes, ranging from -1 to -2.3 in the magnitude range -18<Mr←14. We investigate the LF in the very relaxed cluster Abell 496. Our analysis is based on deep images obtained at CFHT with MegaPrime/MegaCam in four bands (u*g'r'i') covering a 1x1deg2 region, which is centred on the cluster Abell 496 and extends to near its virial radius. The LFs are estimated by statistically subtracting a reference field taken as the mean of the 4 Deep fields of the CFHTLS survey. Background contamination is minimised by cutting out galaxies redder than the observed Red Sequence in the g'-i' versus i' colour-magnitude diagram. In Abell 496, the global LFs show a faint end slope of -1.55±0.06 and vary little with observing band. Without colour cuts, the LFs are much noisier but not significantly steeper. The faint end slopes show a statistically significant steepening from α=-1.4±0.1 in the central region (extending to half a virial radius) to -1.8±0.1 in the Southern envelope of the cluster. Cosmic variance and uncertain star-galaxy separation are our main limiting factors in measuring the faint end of the LFs. The large-scale environment of Abell 496, probed with the fairly complete 6dFGS catalogue, shows a statistically significant 36Mpc long filament at PA=137°. Our LFs do not display the large number of dwarf galaxies (α≃-2) inferred by several authors, whose analyses may suffer from field contamination caused by non-existent or inadequate colour cuts. Alternatively, different clusters may have different faint end slopes, but this is hard to reconcile with the wide range of slopes found for given clusters and for wide sets of clusters.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Abell 496 - galaxies: luminosity functions, mass function

Simbad objects: 11

goto Full paper

goto View the reference in ADS

Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 813 0
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2009 1
3 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 666 2
4 ACO 539 ClG 05 16 35.1 +06 27 14           ~ 245 2
5 ACO 1185 ClG 11 10 31.4 +28 43 39           ~ 247 1
6 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1008 1
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6035 0
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4351 2
9 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 390 0
10 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1120 1
11 NAME Local Group GrG ~ ~           ~ 7261 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...479..335B and select 'bookmark this link' or equivalent in the popup menu


2021.05.13-05:10:31

© Université de Strasbourg/CNRS

    • Contact