Euclid preparation. Methodology for validating the Euclid Catalogue of Galaxy Clusters using external data
astro-ph.CO
/ Authors
Euclid Collaboration, J. -B. Melin, S. A. Stanford, A. Widmer, P. Tarrío, J. G. Bartlett, T. Sadibekova, G. W. Pratt, M. Arnaud, F. Pacaud
and 308 more authors
T. H. Reiprich, A. Biviano, S. Bardelli, S. Borgani, P. -S. Corasaniti, S. Ettori, A. Finoguenov, Z. Ghaffari, P. A. Giles, M. Girardi, J. B. Golden-Marx, A. H. Gonzalez, M. Klein, G. F. Lesci, M. Maturi, B. J. Maughan, L. Moscardini, M. Pierre, M. Radovich, P. Rosati, J. G. Sorce, E. Tsaprazi, B. Altieri, A. Amara
/ Abstract
We present our methodology for identifying known clusters as counterparts to objects in the Euclid Catalogue of Galaxy Clusters (ECGC). Euclid is expected to detect a large number of optically-selected galaxy clusters over the approximately 14000 square degrees of its extragalactic sky survey. Extending out well beyond redshift unity, the catalogue will contain many new high-redshift clusters, while at lower redshifts a fraction of the clusters will have been observed in other surveys. Identifying these known clusters as counterparts to the Euclid-detected clusters is an important step in the validation and construction of the ECGC to augment information with external observables. We present a set of catalogues and meta-catalogues of known clusters that we have assembled for this step, and we illustrate their application and our methodology using the Dark Energy Survey Year 1 RedMaPPer cluster catalogue in lieu of the future ECGC. In the process of this work, we have constructed and deliver an updated EC-RedMaPPer catalogue with multi-wavelength counterparts.