RT info:eu-repo/semantics/masterThesis
T1 Desarrollo de una estrategia de observación de características espectrales en blázares con CTA
A1 Graña González, Antía
A2 Máster Universitario en Astrofísica
AB Gamma rays are the most energetic type of electromagnetic radiation in the Universe, generated by non-thermal mechanisms that take place during the most energetic processes in thecosmos. The gamma-ray sky is dominated by blazars, a subclass of active galactic nucleus(AGN) in which one of its relativistic jets points towards the Earth. The gamma radiation isattenuated in its path to Earth by interacting with the extragalactic background light (EBL)via pair production. This attenuation is more pronounced for sources located at high redhiftsand for very energetic gamma rays, producing the absorption and distortion of the gammaray spectrum specially at very high energies (VHE, E>100 GeV). Therefore, to study theintrinsic spectrum emitted by the source, we must first correct this effect on the observedspectrum.Gamma rays cannot be detected directly from terrestrial observatories, since when they passthrough the atmosphere they interact with air molecules producing a cascade of subatomicparticles. The way to detect gamma rays from the ground is through the detection of theso-called ’Cherenkov radiation’, which results from the generated electromagnetic cascade.Cherenkov radiation is in the range of blue and ultraviolet light whose peak emission occursat ∼350 nm. This type of radiation is produced when a charged particle passes through adielectric medium at speeds exceeding those of light in that medium. This is what happens tothe electrons and relativistic positrons in the cascade when they interact with air molecules.Cherenkov telescopes that detect this radiation are known as ’IACTs’ (Imaging AtmosphericCherenkov Telescopes). The Cherenkov Telescope Array (CTA) is a scientific project whichaims at building more than 100 new generation IACTs for the detection of VHE gamma rays.CTA will consist of two large telescope arrays, one in the southern hemisphere (Paranal Observatory, Chile) and one in the northern (Roque de los Muchachos Observatory, La Palma,Spain). Three types of telescopes with different sizes and sensitivities will be distributed:the LSTs (Large Size Telescopes) for the study of low energy gamma rays (30 - 150 GeV),the MSTs (Medium Size Telescopes) for intermediate energy gamma rays (150 GeV - 5 TeV)and the SSTs (Small Size Telescopes) for higher energy gamma rays (1 - 300 TeV). Theseare the energy ranges where the sensitivity is optimized, but they can actually detect higherand lower energies depending on the telescope.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/23268
UL http://riull.ull.es/xmlui/handle/915/23268
LA es
DS Repositorio institucional de la Universidad de La Laguna
RD 28-abr-2024