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Session: Extragalactic Astronomy and Astrophysics

Name: Ms. Olga Kefallinou (National & Kapodistrian Univ. of Athens)
Coauthors: No coauthors were included.
Type: Poster
Title: Models of non-thermal gamma radiation of blazars
Abstract:

Blazars are active galactic nuclei (AGNs) with their relativistic jets pointed toward the observer. Due to the orientation of the jet, the flux across the electromagnetic spectrum, from radio waves to very high energy gamma-rays, is strongly enhanced by relativistic Doppler boosting. According to leptonic models for the high-energy emission from blazars, relativistic electrons in the inner jets inverse-Compton scatter photons from a variety of sources. The high energy radiation is produced via inverse Compton (IC) scattering of low-energy photon fields that can be either synchrotron emission (synchrotron self-Compton - SSC) or can originate outside the jet. The present project provides an analysis on the beaming of γ-ray radiation in a relativistic moving blob by comparing the External Compton (EC) emission and the Synchrotron-Self-Compton (SSC) emission. Based on these radiation models, and using the ratio of peak synchrotron to EC or SSC fluxes (Compton Dominance) parameters of a sample of blazar sources, such as the magnetic field and jet powers, are derived, knowing the observable physical quantities.