Multivariate search for a directional excess of EeV photons with the Pierre Auger Observatory / Daniel Kümpel. 2011
Inhalt
- Introduction
- Cosmic Rays
- Introduction
- Energy spectrum
- Mass composition
- Anisotropy
- Origin of ultra-high energy cosmic rays
- Cosmic ray propagation
- Extensive Air Showers
- Pierre Auger Observatory
- Surface detector
- Fluorescence detector
- Off line framework
- Fluorescence geometry reconstruction
- Hybrid geometry reconstruction
- Energy determination
- Ultra-High Energy Photons
- Production and origin
- Propagation
- Flux expectations
- Features of UHE photon showers
- Detection and observables
- Experimental status and prospects
- Simulation of UHECR Particle Propagation
- CRPropa framework
- Nucleon interactions
- Secondary electromagnetic cascades
- Background photon spectra and their evolution
- Interactions en route to Earth
- Effect on observed spectra
- GZK-horizon
- GZK photon fluxes from Centaurus A
- Summary
- Simulation Study for Photon/Hadron Discrimination
- CORSIKA production
- Off line simulation and reconstruction
- Observables for photon/hadron discrimination
- Particle Classification in a Multivariate Analysis
- Boosted decision trees
- Artificial neural networks
- Fisher discriminants
- Multivariate analysis workflow
- Examination of the input data set
- Testing multivariate analysis techniques for photon/hadron separation
- Summary
- Search for EeV Photons
- Real data reconstruction
- Hadron reduced data set
- Energy dependence of the BDT response value
- Probability density distribution of events
- Towards sky maps
- Signal density map
- Calculation of the expected background density
- Two-point correlation analysis
- Combining signal and background maps
- Enlargement of the hadron reduced data set
- Galactic Center and Centaurus A region
- Source upper limit on the photon fraction
- Summary
- Summary and Outlook
- Steering CRPropa
- Steering CORSIKA
- Miscellaneous
- Glossary and Abbreviations
- Bibliography
- Acknowledgement
- Index