MEMORY · The cosmic web from eROSITA and galaxy surveys synergy
Horizon Europe — Marie Skłodowska-Curie Actions
- Duration
- 2023-09-01 → 2026-01-31
- EU contribution
- €189,687
- Participants
- 2
- Scheme
- HORIZON-TMA-MSCA-PF-EF
Lines connect the coordinator with its partners.
Results in brief
The cosmic web from eROSITA and galaxy surveys synergy
Galaxies like the Milky Way do not exist isolated in space, but occupy a Large Scale Structure (LSS) in the Universe. The LSS is organized in a network of structures (called the Cosmic Web, CW) whose main components are galaxy clusters (at the nodes), connected by filaments, which frame walls. Walls surround vast empty regions called voids. The structures of the CW are made of dark matter, galaxies, and gas. In galaxy clusters in particular, gas is hot and emits in the X-rays, which makes them relatively easy to detect as bright, diffuse X-ray sources. Matter (including gas and galaxies) is accreted by galaxy clusters through the filaments connected to them, which act as highways for matter flow onto structures. As such, studying galaxy clusters connections to the filaments is a very important topic to understand their properties and evolution. In recent years, a few works have focused on the study of the so-called connectivity-mass relation, i.e. the study of the number of filaments connected to clusters as a function of their mass. However, these studies could only rely on limited samples of clusters within restricted redshift and mass ranges. The objectives of my work were two: 1) to measure the connectivity-mass relation for an extensive sample of X-ray detected clusters, increasing the mass and redshift range where this relation is analyzed and 2) to study the very low mass regime of groups and the high-mass regime of super-clusters, placing these structures in the context of the CW.
Data: CORDIS, © European Union
Project objective
The cosmic web (CW) is a complex network of structures composed of galaxies, dark matter, and gas, formed of galaxy clusters connected by filaments. Low-mass groups and large-scale super-clusters have yet to find a place in the context of the CW. The best way to trace the CW is to use optical galaxy surveys to detect the filaments and X-ray data to detect the hot gas of clusters. The detection of groups and super-clusters requires high-sensitivity X-ray instruments due to the low density of their gas content and has so far been very difficult. The new X-ray telescope eROSITA has however produced X-ray data of unprecedented sensitivity, which allow the discovery of thousands of groups and hundreds of super-clusters. eROSITA opened for the first time the possibility for statistical studies of these structures in the context of the CW. My goal is to exploit the synergy between eROSITA and galaxy surveys to shine new light on the place that groups and super-clusters occupy in the CW. This study will improve our understanding of how filaments channel accretion onto groups and will show how a physical definition for super-clusters (whose definition has so far been empirical) can be achieved in the CW context. The study of the CW is entering a phase of increased interest thanks to recent wide-area galaxy surveys and new X-ray data. Investigations like this project are those that will pave the way for future experiments (e.g. Euclid, ATHENA). This research will provide a significant advancement to our understanding of the CW, structure formation, and galaxy evolution. With this research I will gain deep insight on how to integrate X-ray and optical data in the context of a large collaboration. This project will prepare me to better deal with the outcome expected from future galaxy surveys and X-ray telescopes and will make me more suited to become a group leader at an European institution.
Original text from CORDIS.
Participants
Links
- View on CORDIS
- DOI: 10.3030/101061448
- https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e50ea34f25&appId=PPGMS
- https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e52c498e62&appId=PPGMS
Data: CORDIS, © European Union