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Seminari INAF

Extragalactic science with the CTAO

by Dr Jonathan Biteau (Université Paris-Saclay, IJCLab -Institut universitaire de France)

→ Europe/Rome
Sala Jappelli (Osservatorio astronomico di Padova)

Sala Jappelli

Osservatorio astronomico di Padova
Description

Beyond the Milky Way, the universe has begun to reveal its mysteries in gamma rays thanks to current-generation imaging Cherenkov telescopes. The new generation of gamma-ray observatories, in particular the Cherenkov Telescope Array Observatory (CTAO), promises to transform our understanding of the extragalactic ecosystem at the frontier of the universe's electromagnetic spectrum. This observatory is poised to provide information on non-thermal astrophysical processes occurring up to cosmic noon (z ~ 2) and beyond. These processes include the acceleration of hadrons and leptons in galaxies within the Local Volume (< 10 Mpc) and in nearby galaxy clusters (< 100 Mpc). They also include the evolution of jetted supermassive and stellar-sized black holes throughout the cosmic history of accretion and star formation. Extragalactic gamma-ray observations probe dark-matter candidates, including primordial black holes, weakly interacting particles, and wave candidates like axions. Future gamma-ray observations will also enable key cosmological measurements. These include the universe's thermal output, large-scale magnetic fields, and its expansion rate. Currently, extragalactic gamma-ray astronomy provides constraints on the Hubble constant with a precision comparable to that obtained with gravitational waves. In the coming years, gamma-ray observations may be able to contribute to resolving the current tensions regarding this key cosmological parameter. Some phenomena probed by extragalactic gamma-ray astronomy even touch on the foundations of the Standard Model, promising constraints on Lorentz symmetry and cosmological phase transitions. This presentation provides an overview of current research in extragalactic gamma-ray astronomy and explores the expected precision measurements and groundbreaking discoveries in the coming years.

Join Zoom Meeting  
 
Meeting ID: 824 8288 3288 
Passcode: 072472
Organised by

Elisa Prandini

Prof.