Very-high-energy astrophysics studies the most energetic photons in the sky allowing the exploration of the violent and extreme non-thermal phenomena in the Universe. Significant advances in knowledge have been made in this field using ground-based imaging atmospheric Cherenkov telescopes (IACTs) as detectors to study the very-high-energy physical processes in the Universe. This book reviews the progress in the field since the advent of the second generation IACTs in around 2004.Going through the scientific highlights obtained by the three current instruments of this kind, H.E.S.S., VERITAS and MAGIC, operating now for more than ten years, this book presents a state-of-the-art knowledge in four areas of modern astrophysics and cosmology, namely the origin of the cosmic rays, the physic of compact objects and their resulting relativistic outflows, gamma-ray cosmology and the search for dark matter. Along with a detailed review of the outstanding scientific outcome, a summary of the key technological developments that yielded to the recognized success of the technique is also provided.This book is written for young academics in the fields of astrophysics, high energy physics and cosmology. At the same time, it can serve as a source of reference for the expert in the field.Key Features: oA timely review of advances in high-energy astrophysics following the observations by the third generation IACTsoAn ideal textbook for senior undergraduates or beginning graduate students. It could be the one-stop-shop for an academic in related fieldsoOffers the young researchers a perspective on both the experimental developments as well as the scientific advances in the last ten years, informs them about the new challenges and open questions for future work

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