Unit:
Τομέας Αστροφυσικής, Αστρονομίας και ΜηχανικήςLibrary of the School of Science
Author:
Αρφάνη Δάφνη-Ευγενία
Supervisors info:
Μαστιχιάδης Απόστολος Αναπλ. Καθηγ. (Επιβλέπων), Βλαχάκης Νεκτάριος Επίκ. Καθηγ., Αποστολάτος Θεοχάρης Επίκ. Καθηγ.
Original Title:
Μη γραμμική απορρόφηση ακτίνων γ σε συμπαγείς πηγές υψηλών ενεργειών
Translated title:
Non-linear γ-ray absorption in compact gamma-ray sources
Summary:
We study a non-linear mechanism for producing intrinsic broken power law
spectra in the GeV-TeV energy range in AGNs Spectral Energy Distributions
(SEDs), based on the principles of automatic photon quenching, according to
which, γ-rays are being absorbed on spontaneously produced soft photons,
whenever the injected luminosity in γ-rays lies above a certain critical
value. More specifically, we derive an
analytical expression for the critical γ-ray compactness in the monoenergetic
case of γ-ray injection and we generalize in the case of injection in two,
three and finally in N discrete energies in γ-rays. We finally discuss our
results and the features of the mechanism that can be tested observationally.
Keywords:
AGNs, Gamma rays, Non linear, Radiation mechanisms:non thermal, Critical compactness
