SILVA, S. V. B.; http://lattes.cnpq.br/0814169951041922; SILVA, Samuel Victor Bernardo da.
Résumé:
Active galaxy nuclei (AGNs) are galaxies whose nucleus emits a huge amount of energy
with a non-thermal (non-stellar) spectrum. These astrophysical objects are among the
most energetic phenomena in the Universe. Numerous subclasses of AGNs have been
defined based on their observed characteristics. Among them, we have the blazars,
which emit relativistic jets oriented towards the Earth. These jets are beams of ionized
matter accelerated close to the speed of light, which radiate energetically across the entire
electromagnetic spectrum. Modeling the radiation emission spectrum of blazars through
radioactive processes of relativistic charged particles allows us to derive the spectral
distribution of non-thermal energy from these sources, to infer information about the
particle acceleration mechanisms at the source, as well as to investigate the composition
of the jet. Blazars emit radiation across the entire electromagnetic spectrum from radio to
the highest energy gamma rays. The observation of high-energy gamma rays by several
detection experiments shows that blazars can accelerate particles to ultra-relativistic
energies. However, the physical mechanisms responsible for accelerating particles to
very high energies are still not well understood. Understanding such mechanisms is
fundamental since the production of the highest energy radiation is associated with the
acceleration processes of the ultra high-energy cosmic rays, as well as the production of
neutrinos. Comparison of multiwavelength observations of blazars with numerical models
that calculate radioactive emissions from the source represents the main tool for probing
the microphysics inside the source and its physical parameters (such as the radiation
emission region and the particle content). Therefore, this research work aims to investigate
the spectral energy distribution of AGN sources detected in gamma rays.
