Mass, Light and Colour of the Cosmic Web in the Supercluster SCL2243-0935 (z=0.447)

Abstract

Context: In 2.2m MPG-ESO/WFI data we discovered several mass peaks through weak lensing, forming a possible supercluster at redshift 0.45. Through multi-colour wide-field imaging with CFHT/Megaprime and INT/WFC we identify early-type galaxies and trace the supercluster network with them. Through EMMI/NTT multi-object spectroscopy we verify the initial shear-selected cluster candidates. Using weak lensing we obtain mass estimates for the supercluster centre and the filaments. Results: We identified the centre of the SCL2243-0935 supercluster, MACS J2243-0935, which was found independently by Ebeling et al. (2010). 13 more clusters or overdensities are embedded in a filamentary network, half of them are already spectroscopically confirmed. Three (5-15) Mpc filaments are detected, and we estimate the global size of SCL2243 to 45x15x50 Mpc, making it one of the largest superclusters known at intermediate redshifts. Weak lensing yields r_200=(2.06+/-0.13) Mpc and M_200=(1.54+/-0.29)x10^15 M_sun 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)x10^15 M_sun and M/L=305+/-201 for the three main filaments, consistant with theoretical predictions. The filaments' projected surface mass density is 0.007-0.012, corresponding to 10-100 times the critical density. The greatly varying density of the cosmic web is also reflected in the mean colour of galaxies. Conclusions: 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.

26 pages, 16 figures, accepted for publication Astronomy and Astrophysics. Minor corrections implemented as requested by the referee

References in corpus (17)

• A direct empirical proof of the existence of dark matter
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• The Galaxy Content of SDSS Clusters and Groups
• CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations
• Superclusters of galaxies from the 2dF redshift survey. I. The catalogue
• GaBoDS: The Garching-Bonn Deep Survey -- IX. A sample of 158 shear-selected mass concentration candidates
• The dark matter environment of the Abell 901/902 supercluster: a weak lensing analysis of the HST STAGES survey
• Cross-correlation Weak Lensing of SDSS Galaxy Clusters III: Mass-to-light Ratios
• The Cosmic Evolution Survey (COSMOS): a large-scale structure at z=0.73 and the relation of galaxy morphologies to local environment
• The Complex Structure of the Cl 1604 Supercluster at z~0.9
• Superclusters of galaxies from the 2dF redshift survey. II. Comparison with simulations
• The galaxy populations from the centers to the infall regions in z~0.25 clusters
• Weak lensing study of dark matter filaments and application to the binary cluster A 222 and A 223
• BLOX: The Bonn Lensing, Optical, and X-ray selected galaxy clusters -- I. Cluster catalog construction
• Star formation in galaxies along the Pisces-Cetus Supercluster filaments
• The discovery of a massive supercluster at z=0.9 in the UKIDSS DXS
• A Huge Filamentary Structure at z=0.55 and Star Formation Histories of Galaxies at z<1

Cited by in corpus (10)

• CoMaLit III. Literature Catalogs of weak Lensing Clusters of galaxies (LC^2)
• A sample of Seyfert-2 galaxies with ultra-luminous galaxy-wide NLRs -- Quasar light echos?
• Sloan Great Wall as a complex of superclusters with collapsing cores
• About AGN ionization echoes, thermal echoes, and ionization deficits in low redshift Lyman-alpha blobs
• Tracing high redshift cosmic web with quasar systems
• A study of diffuse radio sources and X-ray emission in six massive clusters
• The evolution of high-density cores of the BOSS Great Wall superclusters
• VST-GAME: Galaxy Assembly as a function of Mass and Environment with VST. Photometric assessment and density field of MACSJ0416
• Quasi-spherical superclusters
• CHEX-MATE: New detections and properties of the radio diffuse emission in massive clusters with MeerKAT