Dissertation committee:
Αναπλ. Καθηγητής Απ. Μαστιχιάδης (επιβλέπων) , Καθηγητής Καν. Τσίγκανος, Επικ. Καθηγητής Νεκ. Βλαχάκης
Summary:
In this thesis we studied the relation of the time-dependent, multi-wavelength
emission of active galaxies with the characteristics of particle acceleration.
For the description of the emission of active galaxies we developed a two-zone
leptonic model, where electrons are accelerated from a shock wave moving along
the jet and then enter a wider area where they lose energy through synchrotron
radiation and inverse Compton scattering the disc photons.
Flare production in active galaxies was attributed to the time-dependency of
one or more of the following parameters: injection rate, acceleration time,
escape time and magnetic field. With this way, a large variety of X- and γ-ray
flares was produced, which were examined regarding to their characteristics.
Emphasis was given on the size, duration and shape of the flares, as well as on
the time lags between low- and high-frequency flares.
The results were compared to the observed flares of two active galaxies. The
successful application of the model to these objects suggests that the model is
capable of explaining satisfactorily particle acceleration in active galaxies.
Keywords:
Active galaxies, Electron acceleration, Synchrotron radiation, Inverse Compton scattering, Flares
