Abstract
High-energy photons are a powerful tool to understand the most violent phenomena in our Universe. However, detecting gamma-ray photons is a daunting task both owing to the overwhelming presence of cosmic rays and to the opacity of our atmosphere. Thus, direct detection of gamma-ray photons must be done in space, while instruments on the ground can see very high-energy photons through the secondary particles they produce in the atmosphere. Mastering space instruments as well as ground-based ones required decades of relentless efforts implying hardware and software developments as well as theoretical studies and extensive simulations. Space instruments, as well as ground-based ones, are now producing a steady flow of important results often in conjunction with observatories working at different wavelengths. Multi-messenger astronomy, which combines the electromagnetic channel with gravitational waves and neutrinos, is the newly born discipline to which high-energy gamma-ray detectors provide an essential contribution. Building instruments to continuously cover the gamma-ray sky is, thus, a priority for the astronomical community which is looking forward for the Cherenkov Telescope Array, a new generation ground based gamma-ray observatory designed to monitor, to study and to unveil the mysteries hidden in the very high energy sky.
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Science with the Cherenkov Telescope Array. Edited by CTA Consortium. Published by World Scientific Publishing Co. Pte. Ltd., 2019. ISBN#9789813270091 https://www.worldscientific.com/worldscibooks/10.1142/10986.
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Acknowledgements
I would like to thank Angelo Antonelli, Igor Oya and Giovanni Pareschi for their careful reading of the manuscript. An anonymous referee provided very useful comments. Inputs from Federico Ferrini, Jurgen Knodlseder and Salvo Scuderi are gratefully acknowledged.
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Caraveo, P.A. The golden age of high-energy gamma-ray astronomy: the Cherenkov Telescope Array in the multimessenger era. Riv. Nuovo Cim. 43, 281–318 (2020). https://doi.org/10.1007/s40766-020-00006-3
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DOI: https://doi.org/10.1007/s40766-020-00006-3