S-PLUS DR1 galaxy clusters and groups catalogue using PzWav

TL;DR

This paper presents a new galaxy cluster catalogue from the S-PLUS survey using the PzWav detection algorithm, demonstrating high purity and completeness, and validating its effectiveness against known clusters.

Contribution

The paper introduces the PzWav algorithm for galaxy cluster detection in multi-filter photometric data, achieving high accuracy and validating it with simulations and known cluster samples.

Findings

80% purity and completeness at S/N>3.3 for clusters with M_{200} > 10^{14} M_00.

Positional and redshift accuracy with scatter of 12 kpc and 8.8e-3, respectively.

Recovers ~80% of known X-ray and SZ clusters, validating the method.

Abstract

We present a catalogue of 4499 groups and clusters of galaxies from the first data release of the multi-filter (5 broad, 7 narrow) Southern Photometric Local Universe Survey (S-PLUS). These groups and clusters are distributed over 273 deg$^2$ in the Stripe 82 region. They are found using the PzWav algorithm, which identifies peaks in galaxy density maps that have been smoothed by a cluster scale difference-of-Gaussians kernel to isolate clusters and groups. Using a simulation-based mock catalogue, we estimate the purity and completeness of cluster detections: at S/N>3.3 we define a catalogue that is 80% pure and complete in the redshift range 0.1<z<0.4, for clusters with $M_{200} > 10^{14}$ M$_\odot$. We also assessed the accuracy of the catalogue in terms of central positions and redshifts, finding scatter of $\sigma_R=12$ kpc and $\sigma_z=8.8 \times 10^{-3}$, respectively. Moreover, less than 1% of the sample suffers from fragmentation or overmerging. The S-PLUS cluster catalogue recovers ~80% of all known X-ray and Sunyaev-Zel'dovich selected clusters in this field. This fraction is very close to the estimated completeness, thus validating the mock data analysis and paving an efficient way to find new groups and clusters of galaxies using data from the ongoing S-PLUS project. When complete, S-PLUS will have surveyed 9300 deg$^{2}$ of the sky, representing the widest uninterrupted areas with narrow-through-broad multi-band photometry for cluster follow-up studies.