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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Experimentelle Elementarteilchenphysik | H.E.S.S. | Theses | Estimation of trigger rates, data rates and data volumes for CTA and observations of SNR RX J0852.0−4622 with H.E.S.S.

Licenciado M Paz Arribas (2016)

Estimation of trigger rates, data rates and data volumes for CTA and observations of SNR RX J0852.0−4622 with H.E.S.S.

PhD thesis, Humboldt-Universität zu Berlin.

This work focuses on two different aspects of γ-ray astronomy. On the one hand, it studies the instrumental challenge posed by the future CTA Observatory by estimating the amount of data to be collected. On the other hand, it studies supernova remnants, by presenting analysis results of the γ-ray data of the RX J0852.0−4622 supernova remnant measured with the operating H.E.S.S. experiment and interpreting them in order to check the plausibility of RX J0852.0−4622 being a cosmic ray accelerator. In addition, an outlook on the capabilities of CTA for studying supernova remnants is also presented, using RX J0852.0−4622 as an example. With its improved sensitivity, CTA will face a background rate unprecedented in Cherenkov telescope systems. The first part of this work evaluates the amount of data that needs to be handled by the detectors, the read-out system and the storage system of CTA. Based on an analysis of simulated data, the more demanding southern array is expected to have an array trigger rate of ∼ 13 kHz, a data rate of up to 2500 MB/s and a data volume after 15 yr of operation and assuming a duty cycle of 15% of up to 165 PB. The design of the data acquisition and storage systems will be a challenge but should be manageable with existing technologies. More than 100 yr after their discovery, the origin of cosmic rays is still a mys-tery. Supernova remnants are believed to be the accelerators of Galactic cosmic rays, although no definite proof exists as of today. The second part of this work presents detailed morphological and spectral analysis of γ-ray data from the supernova remnant RX J0852.0−4622 measured with the H.E.S.S. experiment in order to evaluate the γ-ray emission on the perspective of hadronic and leptonic emission models. The more precise measurements permit a better determination of the parent particle population properties with respect to previous publications. More precisely, a clear curvature of the spectrum of RX J0852.0−4622 is measured with an exponential energy cut-off at 7.2 TeV. Finally, the analysis of simulated data shows that CTA should be able to significantly improve the determination of the spectral energy cut-off of RX J0852.0−4622, which should help in identifying the nature of the γ-ray emission.