Fiori, Michele (2019) High Sensitivity Studies of Pulsar Wind Nebulae with CTA and ASTRI Mini-array. [Ph.D. thesis]
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Abstract (italian or english)
In this Thesis, I present some perspective studies of a particular class of Galactic sources, the Pulsar Wind Nebulae (PWNe), in the most energetic part of the electromagnetic spectrum, the Very-High-Energy gamma-rays. These sources represent the most numerous class of identified Galactic VHE gamma-ray sources. They are highly magnetized nebulae powered by young and energetic pulsars. Inside them, charged particles are effectively accelerated to very high energies emitting photons up to ~100 TeV. This investigation aims at assessing the capabilities of observing these sources with the future Imaging Atmospheric Cherenkov Telescopes (IACTs): The Cherenkov Telescope Array (CTA) and the ASTRI Mini-array. These facilities will be used for testing the various theoretical models of the gamma-ray emission from these powerful sources. To assess the capabilities of CTA and the ASTRI Mini-array I have simulated and analyzed two young PWNe: SNR G0.9+0.1 and MSH 15-52. To better understand this class of objects and to make predictions on the shape at the VHE part of their spectrum, a one-zone time-dependent leptonic model has been implemented. In this model, the temporal evolution of the leptonic population is computed taking into account the continuous input of energy from the central pulsar and the interaction of the nebula with the surrounding ejecta of the Supernova Remnant (SNR). I have also carried out a detailed study of the systematic uncertainties that affect the estimate of the spectral parameters for observations with the CTA South array. In the context of the ASTRI Mini-array, I worked on testing the data analysis chain, simulating the same sources mentioned above. The purpose of this work was to select the most interesting targets for future observations and to test the performance of the array. A preliminary list of PWNe that could be studied from the Northern hemisphere with the ASTRI Mini-array is also reported.
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