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An omnipresent feature of the "cosmic web" — the large-scale filamentary backbone of the Universe

— is represented by a warm/hot gas component. This is a dominant component in the overall matter

budget on a multi-scale realm spanning from Mpc-scale intergalactic filaments, to the intracluster

medium (ICM) and the circumgalactic medium (CGM) surrounding individual galaxies. Therefore, the

study of the warm/hot gas represents a powerful means for tracing the matter assembly in the

Universe, its thermal history, and the intertwined evolution of galaxies and their large-scale

environment. In my talk, I will discuss how advanced (sub)millimeter facilities like the Atacama Large

Millimeter/Submillimeter Array (ALMA) have revolutionized our perspective on the hot and ionized

Universe via the possibility of tracing the multi-faceted Sunyaev-Zeldovich (SZ) effect — a peculiar

spectral signature imprinted in the ubiquitous cosmic microwave background by the warm/hot gas

within cosmic structures. Still, it is only with the unparalleled combination of sensitivity, angular

resolution, and spectral coverage of the Atacama Large Aperture Submillimeter Telescope (AtLAST)

that we will be able to conclusively open an SZ window on the hot Universe. The EU-funded Phase 1

Design Study for this future 50m-class facility has recently concluded, and I will provide an overview

of its main outcomes.

Thursday February 20th 2025 time 11:30 CET

Join IN PERSON in Aula Grassano (Physics Dept., Tor Vergata University)

or online on MS Teams: https://rebrand.ly/Seminar-DiMascolo

Ref: Pasquale Mazzotta (pasquale.mazzotta@roma2.infn.it)

ASTROPHYSICS SEMINAR

A resolved SZ view of the hot Universe

Luca Di Mascolo

Kapteyn Astronomical Institute