Exploring remote cluster outskirts and filaments
Matteo Angelinelli (DIFA - INAF OAS Bologna)
Tuesday 23/03/2021 @ 14:00, Sala IV piano Battiferro
Lead by gravity, Universe is self-organized in a spider web pattern. This peculiar structure is called "Cosmic Web". In the Universe, we identify knots, filaments and voids. The knots are the larger structures in the Universe, where galaxy clusters form, while filaments connect different knots and induce high-velocity mass accretions onto clusters. Using numerical simulations, I study small matter clumps that in-fall in galaxy clusters. Understanding how these clumps interact with the surrounding medium may help assess how galaxy clusters evolve through cosmic time, as well as suggest how to detect filaments in X-rays, nowadays invisible. Indeed, using current X-ray telescopes, we observe only greater and brighter clumps, but to completely understand the physics behind them, we need more sophisticated instruments. For this reason, I simulate what ATHENA, ESA mission which will fly in the 2030s, will observe around galaxy clusters. The evolution of galaxy clusters is a key ingredient of our cosmological paradigm and, assessing the physics mechanism which regulates this evolution helps us to understand how the Universe evolved.