I will discuss the role of non-thermal pressure support as a major source of the difference between the hydrostatic and the total ``true'' halo mass in galaxy clusters. I will present new models and methods to constrain the non-thermal pressure, highlighting the role of the next generation of X-ray observatories, like XRISM and NewAthena, in constructing a consistent picture of the formation and composition in mass and energy of galaxy clusters.
BIO
Stefano Ettori is a senior astrophysicist at the National Institute for Astrophysics (INAF), based at the Astrophysics and Space Science Observatory in Bologna, Italy. He specializes in the formation and evolution of galaxy clusters, focusing on their thermodynamic and structural properties. His work integrates multi-wavelength observations and hydrodynamical simulations to study the interplay between hot plasma, dark matter, and large-scale structure formation. With over 470 publications and more than 18,000 citations, Ettori is recognized as a leading expert in cluster astrophysics and cosmology.
