Observing clusters of galaxies in the X-ray domain

Séminaire

9 septembre 2020

le 11 décembre 2020, 11h à 13h, Nicolas Clerc, salle Coriolis

Observations of galaxy clusters at X-ray wavelengths offer a unique window to understanding the physical processes governing the assembly of large-scale structure in our Universe. X-rays signpost the hot and tenuous gas that permeates the entire volume of galaxy clusters; in fact, these extremely massive objects are the most luminous extended X-ray sources. Being shaped by gravity in the expanding Universe, galaxy clusters are sensitive probes of cosmological models, especially relevant to the study of the ‘dark energy’ component. How many galaxy clusters are known and what does it take to find them all? How do they form and evolve and how diverse are they? What is the interplay between galaxies, dark matter and the hot gas in these systems? I will describe the available techniques and recent progress accomplished in the field of galaxy cluster surveys, with particular emphasis on results obtained by the XMM-Newton and Chandra observatories and the upcoming german-russian eROSITA survey. I will finally highlight the challenges and opportunities offered by high-resolution spectroscopy in the X-ray, such as enabled by future facilities like Athena.

Plus d'actualités

The first astronomical databases (700 BC – 100 BC): Babylonian systems and Hipparcus’ works

le 15 novembre 2023, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: It is not possible to develop a mathematical model without a reliable and consistent database.In this session, I will first detail the cultural context that led the Babylonian « astronomers » to establish formidable data collections in the form of clay tablets. […]

A peculiar density profile inside Jupiter

le 6 décembre 2024, 10h45 à 12h45, Florian Debras, salle Jules Verne, OMP, site Belin Resumé: Since 2016, the Juno satellite is orbiting Jupiter and has completely changed our understanding of the planet. From the atmosphere to the deep interior, including the auroras, Juno is providing a wealth of data that challenges models of Jupiter. […]

A step by step rupture (Vth century AD – XVth century AD)

le 22 novembre 2024, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: In this session, I will review the results obtained by historians of astronomy over the last fifty years, which have led to a complete rethinking of the idea of a scientific revolution developed in the mid-twentieth century.I will first […]

Rechercher