Improvements to the Reconstruction of Monoscopic Events in H.E.S.S., with 
Application to the Analysis of a Flare of the Blazar PKS 0903-57

Deka Baruah, Anita

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学位論文

Improvements to the Reconstruction of Monoscopic Events in H.E.S.S., with Application to the Analysis of a Flare of the Blazar PKS 0903-57

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Deka Baruah, Anita
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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引用

Deka Baruah, A. (2024). Improvements to the Reconstruction of Monoscopic Events in H.E.S.S., with Application to the Analysis of a Flare of the Blazar PKS 0903-57. Master Thesis, Indian Institute of Science Education and Research, Tirupati.

引用: https://hdl.handle.net/21.11116/0000-000F-2622-0

要旨

The High Energy Stereoscopic System is an array of five imaging atmospheric Cherenkov telescopes that detects air showers produced by very high energy g-rays. To exploit the full energy range of the experiment (tens of GeV upto 100 TeV), a combined analysis of detected g-ray events of various quality classes needs to be carried out. In particular, the events detected by the 28m telescope (CT5) are very important because they are mostly at low energies and a stereoscopic view aiding the reconstruction of the air shower is not possible. In this thesis, we present improvements carried out on CT5’s energy and angular monoscopic reconstruction. We utilise next-generation air shower simulations, new image parameters and machine learning tools such as artificial neural networks for this work. Furthermore, upon implementing these improvements in the H.E.S.S. data analysis chain, we carry out a high-level Gammapy analysis of the 2020 H.E.S.S. observations of the flaring blazar PKS 0903-57.

This work sets the ground for ongoing and future work on finalising the implementation of the various event quality classes in the H.E.S.S. pipeline, which shall ultimately boost the sensitivity of the experiment for the detection of g-ray bursts and flares from distant active galactic nuclei.