Monte Carlo simulations of the timing structure of Cherenkov wavefronts of sub-100 GeV gamma ray air showers

Details Monte Carlo simulations of the timing structure of Cherenkov wavefronts of sub-100 GeV gamma ray air showers Monte Carlo simulations of the timing structure of Cherenkov wavefronts of sub-100 GeV gamma ray air showers

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1616p&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1616-1620 (1997).

Mathematics

Gamma-Ray, Mathematical Procedures And Computer Techniques, X- And Gamma-Ray Telescopes And Instrumentation, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We present a Monte-Carlo study of the phenomenology of Cherenkov light wavefronts from low energy gamma ray induced air showers. Experimentally the measurements of the spatially distributed arrival times of the wavefronts of the Cherenkov light of gamma ray air showers have been used to extract the directions of the showers. This has mainly been done for >500 GeV showers using a conical fit to the timing structure of the wavefront. This directionality is then used to contribute to the rejection of background showers (mainly hadron induced showers) which arrive isotropically. Investigation of the arrival times of simulated Cherenkov photons from gamma ray induced air showers of energies 100 GeV and below reveals that there is greater variation in the morphology of the wavefronts than at the higher energies and that the fitting of simple conical functions to determine arrival directions may no longer be appropriate. We demonstrate that the detailed structure of the wavefront of these low energy gamma ray showers is primarily determined by the height distribution of the emitting cascade particles. Preliminary work suggests a correlation between the shape of the wavefront and the height of shower-maximum.

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