Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-11-03
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
9 pages; in Proceedings of IAU Symposium 275, "Jets at all Scales", Buenos Aires, Argentina, 13-17 September 2010, eds. G.E. R
Scientific paper
The matter content of relativistic jets in AGNs is dominated by a mixture of protons, electrons, and positrons. During dissipative events these particles tap a significant portion of the internal and/or kinetic energy of the jet and convert it into electromagnetic radiation. While leptons - even those with only mildly relativistic energies - can radiate efficiently, protons need to be accelerated up to energies exceeding $10^{16-19}$ eV to dissipate radiatively a significant amount of energy via either trigerring pair cascades or direct synchrotron emission. Here I review various constraints imposed on the role of hadronic non-adiabatic cooling processes in shaping the high energy spectra of blazars. It will be argued that protons, despite being efficiently accelerated and presumably playing a crucial role in jet dynamics and dissipation of the jet kinetic energy to the internal energy of electrons and positrons, are more likely to remain radiatively passive in AGN jets.
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