Astronomy and Astrophysics, volume 532A, 57-57 (2011/8-1)
Mass, light and colour of the cosmic web in the supercluster SCL 2243-0935 (z=0.447).
SCHIRMER M., HILDEBRANDT H., KUIJKEN K. and ERBEN T.
Abstract (from CDS):
In archival 2.2m MPG-ESO/WFI data we discovered several mass peaks through weak gravitational lensing, forming a possible supercluster at redshift 0.45. Through wide-field imaging and spectroscopy we aim to identify the supercluster centre, confirm individual member clusters, and detect possible connecting filaments. Through multi-colour imaging with CFHT/Megaprime and INT/WFC we identify a population of early-type galaxies and use it to trace the supercluster network. EMMI/NTT multi-object spectroscopy is used to verify the initial shear-selected cluster candidates. We use weak gravitational lensing to obtain mass estimates for the supercluster centre and the filaments. We identified the centre of the SCL2243-0935 supercluster, MACS J2243-0935, which was found independently by Ebeling et al. (2001ApJ...553..668E
). We found 13 more clusters or overdensities embedded in a large filamentary network. Spectroscopic confirmation for about half of them is still pending. Three (5-15)h70–1
Mpc filaments are detected, and we estimate the global size of SCL2243 to be 45x15x50h70–1
Mpc, making it one of the largest superclusters known at intermediate redshifts. Weak lensing yields r200
Mpc and M200
for MACS J2243 with M/L=428±82, very similar to results from size-richness cluster scaling relations. Integrating the weak lensing surface mass density over the supercluster network (defined by increased i-band luminosity or g-i colours), we find (1.53±1.01)x1015
and M/L=305±201 for the three main filaments, consistant with theoretical predictions. The filaments' projected dimensionless surface mass density κ varies between 0.007-0.012, corresponding to ρ/ρcrit
=10-100 depending on location and de-projection. The greatly varying density of the cosmic web is also reflected in the mean colour of galaxies, e.g. <g-i≥2.27mag for the supercluster centre and 1.80 mag for the filaments. SCL2243 is significantly larger and much more richly structured than other known superclusters such as A901/902 or MS0302 studied with weak lensing before. It is a text-book supercluster with little contamination along the line of sight, making it a perfect sandbox for testing new techniques probing the cosmic web.
galaxies: clusters: individual: SCL2243-0935 - gravitational lensing: weak - large-scale structure of Universe - cosmology: observations dark matter
VizieR on-line data:
<Available at CDS (J/A+A/532/A57): tablea1.dat>
[SHK2011] SCL 2243-0935 N=1. Fig. 4, Table 3: [SHK2011] SCL2243-A (Nos A-N). Table A1: [SHK2011] JHHMMSS.ss+DDMMSS.s N=99.
+ corrigendum vol. 551, p. C2 (2013)
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