Research article2026
S-PLUS Clusters And Large-scale Environments (SCALE): II. PZWav versus redMaPPer identification of eRosita groups
L. Doubrawa (Member, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226 - Butantã, São Paulo - SP, 05508-090, Brazil)†, A. Finoguenov, E. S. Cypriano (Member, Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, U. de São Paulo, SP, 05508-090, Brazil), C. Mendes de Oliveira (Principal investigator, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226 - Butantã, São Paulo - SP, 05508-090, Brazil), E. V. Lima (Member, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226 - Butantã, São Paulo - SP, 05508-090, Brazil), L. Nakazono (Member, Observatório Nacional, Rua Gal. José Cristino 77, 20921-400, Rio de Janeiro, RJ, Brazil), G. Souza, J. Comparat
† Corresponding author
Astronomy & Astrophysics, 2026
Abstract
We present the construction and characterization of a multi-wavelength catalog of galaxy groups and clusters by matching optical detections from the Southern Photometric Local Universe Survey (S-PLUS) with extended X-ray emission from the first eROSITA all-sky survey data release (eRASS1). We employ a probabilistic matching framework, based on the modified Hausdorff distance, to associate galaxy systems identified by the PZWav cluster finder and characterized by the AME membership estimator with X-ray surface brightness contours. This method explicitly accounts for the photometric redshift probability distribution of galaxies and allows us to explore the critical trade-off between catalog completeness and purity. We investigate how the matched sample changes with different optical selection depths, defined by absolute magnitude cuts of $M_r$ < -18.5, -19, -19.5, and -20 sampling redshifts within 0.08 < z < 0.25, and across purity levels of 80%, 90%, and 95%. We find that fainter optical cuts enhance the recovery of low-mass, low-luminosity groups, while brighter cuts favor more massive clusters and increase the effective survey volume at higher redshifts. Stricter purity requirements reduce contamination but systematically lower completeness, particularly for low-luminosity systems. The derived X-ray luminosity functions agree well with previous determinations, and the logN-logS distributions confirm the high recovery rate of luminous clusters. Comparisons with the redMaPPer cluster catalog validate our approach, showing consistent trends and significant overlap, while our method offers improved completeness at the group scale. This work demonstrates a robust, flexible methodology for creating reliable multi-wavelength cluster catalogs, essential for cosmological studies and investigations of galaxy evolution in dense environments.
Citation
@article{Doubrawa2026, title = {S-PLUS Clusters And Large-scale Environments (SCALE): II. PZWav versus redMaPPer identification of eRosita groups}, shorttitle = {PZWav versus redMaPPer identification of eRosita groups (SCALE)}, language = {en}, journal = {A\&A}, author = {Doubrawa, L. and Finoguenov, A. and Cypriano, E. S. and Mendes de Oliveira, C. and others}, year = {2026}, note = {Accepted} }
