Geomagnetic Field Effects on the Imaging Air Shower Cherenkov Technique

Details Geomagnetic Field Effects on the Imaging Air Shower Cherenkov Technique Geomagnetic Field Effects on the Imaging Air Shower Cherenkov Technique

2007-09-10

arxiv.org/abs/0709.1251v2

Astronomy and Astrophysics

Astrophysics

Contribution to the 30th ICRC, Merida Mexico, July 2007 on behalf of the MAGIC Collaboration Changes: corrected typos, changed

Scientific paper

Imaging Air Cherenkov Telescopes (IACTs) detect the Cherenkov light flashes of Extended Air Showers (EAS) triggered by very high energy (VHE) gamma-rays impinging on the Earth's atmosphere. Due to the overwhelming background from hadron induced EAS, the discrimination of the rare gamma-like events is rather difficult, in particular at energies below 100 GeV. The influence of the Geomagnetic Field (GF) on the EAS development can further complicate this discrimination and, in addition, also systematically affect the gamma efficiency and energy resolution of an IACT. Here we present the results from dedicated Monte Carlo (MC) simulations for the MAGIC telescope site. Additionally we show that measurements of sub-TeV gamma-rays from the Crab nebula are affected even for a low GF strength of less than 33 micro Tesla.

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