Euclid preparation. XCI. Validation method for the detections in the Euclid Catalogue of Galaxy Clusters using external data
astro-ph.CO
Submitted: 2025-09-08
Updated: 2026-08-31
Comments: This version matches the version accepted by A&A
License: http://creativecommons.org/licenses/by/4.0/
The gist: We present our methodology for identifying known clusters as counterparts to objects in the Euclid Catalogue of Galaxy Clusters (ECGC).
Terminology
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 delivered an updated EC-RedMaPPer catalogue with multi-wavelength counterparts.
Sources
- The SRG/eROSITA All-Sky Survey: The first catalog of galaxy clusters and groups in the Western Galactic Hemisphere
- Euclid Quick Data Release (Q1) -- Data release overview
- Euclid Quick Data Release (Q1). First detections from the galaxy cluster workflow
- The SRG/eROSITA all-sky survey: Cosmology constraints from cluster abundances in the western Galactic hemisphere
- SPT-SZ MCMF: An extension of the SPT-SZ catalog over the DES region
- The SRG/eROSITA All-Sky Survey. Optical identification and properties of galaxy clusters and groups in the western galactic hemisphere
- MCXC-II: Second release of the Meta-Catalogue of X-Ray detected Clusters of galaxies
- A catalog of 1.58 million clusters of galaxies identified from the DESI Legacy Imaging Surveys
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