eSCALE: eRosita and S-PLUS studies on galaxy groups and clusters

• Grant number: 25/11378-1
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: September 01, 2025
• End date: August 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Claudia Lucia Mendes de Oliveira
• Grantee: Lia Doubrawa
• Supervisor: Alexis Finoguenov
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: University of Helsinki, Finland
• Associated to the scholarship: 24/03575-9 - Galaxy alignment in large scale structures until redshfit 0.4, observations and simulations, BP.PD

Abstract

This BEPE project aims to investigate the physical properties of galaxy groups and clusters by combining X-ray data from the eROSITA survey with deep optical observations from the S-PLUS survey. We will focus on the understanding of a typical environment of galaxies in the Universe, by achieving a multi-wavelength characterisation of groups and precision studies of their properties. In particular, we will examine two cases: the environmental factors that drive the cluster evolution at superclusters and their effects on the scaling relations that connect observable quantities, such as richness, optical luminosity, and X-ray luminosity, to cluster mass; and their evolution using galaxy groups and clusters through cosmic time. This document describes a 1-year project to be conducted under the supervision of Prof. Dr. Alexis Finoguenov at the University of Helsinki. As part of this effort, we will also finalise and prepare the public release of a new optical cluster catalogue built with the PZWav cluster finder algorithm, applied to the 6th internal data release from S-PLUS, covering more than 6000 square degrees of the sky. This complete and high-quality catalogue will be an important resource for the southern sky, enabling precise mass estimates and providing a robust foundation for studies of galaxy evolution and large-scale structure. In particular, this work will significantly advance the candidate's ongoing research on galaxy alignments within clusters by providing a clean and well-characterised catalogue of galaxy groups and clusters across the S-PLUS footprint. The availability of precise cluster properties and reliable redshift information will enable a comprehensive analysis of alignment signals and their evolution with redshift, opening new opportunities for understanding the role of large-scale structure in shaping galaxy properties. (AU)