The XXL Survey: XXIII. The Mass Scale of XXL Clusters from Ensemble Spectroscopy

A. Farahi, V. Guglielmo, A. E. Evrard +34

An X-ray survey with the XMM-Newton telescope, XMM-XXL, has identified hundreds of galaxy groups and clusters in two 25 deg${}^2$ fields. Combining spectroscopic and X-ray observatio…