Statistical analysis for membership classification in the Fornax Cluster using S-PLUS data

CALDERÓN, J. P.; SMITH CASTELLI, A. V.; HAACK, R.; GUTIÉRREZ-SOTO, L A; LIMA, E V R; REIS LOPES, A.; MENDES DE OLIVEIRA, C.

La Serena

Congreso; Galaxies Groups and Clusters III: Laboratories to study galaxy evolution; 2023

Universidad de La Serena, Universidad de Talca y NoirLab

In this work we aim at statistically characterising the galaxy population of the Fornax cluster (D ~ 20 Mpc) in the 12 optical bands of the Southern Photometric Local Universe Survey (S-PLUS). The total area covered by this study is more than 200 square degrees, corresponding to the combination of 106 S-PLUS fields, on which a custom SExtractor photometry focus on extended sources was performed.Though S-PLUS is expected to provide photo-zs, this technique will not be suitable to identify new members at the Fornax distance. We performed a principal component analysis (PCA) on the structural and photometric parameters of: (i) a spectroscopically galaxy sample of confirmed Fornax members, (ii) a spectroscopically sample of background galaxies, and (iii) a sample of objects identified by SExtractor with no radial velocities. Additionally, a Random Forest classifier was carried out in order to identify new Fornax members not catalogued before.