TL;DR
This paper reviews the current understanding of gamma-ray emissions from blazars, highlighting observational data and theoretical challenges related to rapid variability and high-energy emissions.
Contribution
It provides a concise overview of recent observational findings and discusses the theoretical issues in modeling blazar gamma-ray emissions.
Findings
Observations by Fermi/LAT and Cherenkov telescopes reveal rapid variability in blazars.
Theoretical challenges include explaining ultra-fast variability and flat spectrum radio quasar emissions.
Current models face difficulties in accounting for the observed high-energy phenomena.
Abstract
Blazars are high-energy engines providing us natural laboratories to study particle acceleration, relativistic plasma processes, magnetic field dynamics, black hole physics. Key informations are provided by observations at high-energy (in particular by Fermi/LAT) and very-high energy (by Cherenkov telescopes). I give a short account of the current status of the field, with particular emphasis on the theoretical challenges connected to the observed ultra-fast variability events and to the emission of flat spectrum radio quasars in the very high energy band.
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