AMICO-COSMOS galaxy cluster and group catalogue up to $z=2$: Sample properties and X-ray counterparts

Abstract

We present a new galaxy cluster search in the COSMOS field through the use of the Adaptive Matched Identifier of Clustered Objects (AMICO). We produced a new cluster and group catalogue up to $z=2$, by performing an innovative application of AMICO with respect to previous successful applications to wide-field surveys, in terms of depth (down to $r<26.7$), small area covered ($1.69de{g}^2$ of unmasked area) and redshift extent. This sample, and the comparative analysis we performed with the X-rays, allowed for the calibration of mass-proxy scaling relations up to $z=2$ and down to less than $10^{13}{M}_{sun}$ and constitutes the base for the refinement of the cluster model for future applications of AMICO, like the analysis of upcoming Euclid data. AMICO is based on an optimal linear matched filter and detects clusters in photometric galaxy catalogues using galaxy location, photometric redshift and, in the simplest case, one galaxy property. We used one magnitude as galaxy property, avoiding explicit use of galaxy colour, and performed 3 independent runs in the r, Y and H bands using both COSMOS2020 and COSMOS2015 galaxy catalogues. The final catalogue resulting from matching the results of the three runs contains 1269 and 666 candidate clusters with $S/N>3.0$ and $>3.5$, respectively. Most of the unmatched ones have $S/N<3.5$ which can be chosen as cut for a more robust sample. We assigned X-ray properties to our detections via matching with a public X-ray group sample and by estimating, for unmatched detections, X-ray properties at the location of AMICO candidates based on Chandra+XMM-Newton data. 622 are the candidates with X-ray flux estimate. This large sample allowed for the calibration of the scaling relations between AMICO mass-proxies and X-ray mass and the study of their redshift dependence for the selection of the most stable photometric bands.

16 pages, 15 figures, 3 tables, submitted to Astronomy & Astrophysics (A&A)

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• The COSMOS-Web deep galaxy group catalog up to $z=3.7$
• COSMOS Brightest Group Galaxies -- III: Evolution of stellar ages
• COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction
• AMICO galaxy clusters in KiDS-1000: cosmological constraints and mass calibration from counts and weak lensing
• AMICO galaxy clusters in KiDS-1000: cosmological sample
• Introducing cosmosTNG: simulating galaxy formation with constrained realizations of the COSMOS field
• Selection Function of Clusters in Dark Energy Survey Year 3 Data from Cross-Matching with South Pole Telescope Detections
• AMICO-WL: an optimal filtering algorithm for galaxy cluster detections with weak lensing
• Star formation quenching precedes morphological transformation in COSMOS-WEB's richest galaxy groups
• Forged by Feedback: Stellar Properties of Brightest Group Galaxies in Cosmological Simulations