A VLT/VIMOS view of two Planck multiple-cluster systems: structure and galaxy properties
Abstract
We analysed spectroscopic data obtained with VLT-VIMOS for two multiple-cluster systems, PLCKG214.6+36.9 and PLCKG334.8-38.0, discovered via their thermal Sunyaev-Zel'dovich signal by Planck. Combining the Optical spectroscopy, for the redshift determination, and photometric data from galaxy surveys (SDSS, WISE, DESI), we were able to study the structure of the two multiple-cluster systems, to determine their nature and the properties of their member galaxies. We found that the two systems are populated mainly with passive galaxies and that PLCKG214.6+36.9 consists of a pair of clusters at redshift z = 0.445 and a background isolated cluster at z = 0.498, whereas the system PLCKG334.8-38.0 is a chance association of three independent clusters at redshifts z = 0.367, z =0.292, and z = 0.33. We also find evidence for remaining star formation activity in the highest-redshift cluster of PLCKG214.6+36.9, at z = 0.498.
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