Observing clusters of galaxies in the X-ray domain

le 21 octobre 2022, 11h à 13h, Nicolas Clerc, salle Jules Verne, OMP, site Belin

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 and the cosmic web. X-rays signpost the hot and tenuous gas that permeates the entire volume of galaxy clusters; in fact, these rare massive objects are the most luminous extended X-ray sources. Galaxy clusters are also sensitive probes of cosmological models, especially relevant to study the ‘dark energy’. 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? We will see some techniques and recent progress accomplished in the field of galaxy cluster science, in particular results obtained by the XMM-Newton and Chandra observatories and the eROSITA survey. We will look to the future and discuss challenges and opportunities offered by high-resolution spectroscopy in the X-ray domain, as facilities like XRISM and Athena will enable.

Plus d'actualités

Séminaire

The ultimate fate of planetary systems

le 28 octobre 2022, 11h à 13h, Sylvie Vauclair, salle Jules Verne, OMP, site Belin The formation and evolution of planetary systems are important subjects. But what about their ultimate fate, when their host stars evolve as red giants, lose their gaseous envelopes as planetary nebulae, and end their lives as white dwarf stars? Recent […]

09.09.2022

Séminaire

The physics of accretion at its extreme: Ultraluminous X-ray sources

le 9 décembre 2022, 11h à 13h, Roberta Amato, salle Jules Verne, OMP, site Belin Ultraluminous X-ray sources (ULXs) are amongst the brightest extra-galactic objects in the X-ray sky. They are characterized by luminosities well above the Eddington limit, the maximum possible luminosity reached when the radiation pressure and the gravitational force are in equilibrium. […]

29.08.2022

Séminaire

Why are warm Jupiters so eccentric ? 

le 16 décembre 2022, 11h à 13h, Florian Debras, salle Jules Verne, OMP, site Belin With more than 5000 exoplanets discovered, we have access to numerous statistics which represent the condition of formation and evolution of planetary systems. One of such statistics is the eccentricity distribution of warm Jupiters: planets around the mass of Jupiter, […]

Rechercher