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EP: Fachverband Extraterrestrische Physik

EP 9: Astrophysik

EP 9.7: Talk

Thursday, March 12, 2015, 16:15–16:30, G.10.02 (HS 9)

Effect of night sky background on H.E.S.S. observations — •Eva Leser — Universität Potsdam

Imaging atmospheric Cherenkov telescopes like the H.E.S.S. experiment in Namibia have to deal not only with a high background rate due to air showers produced by hadrons but also with the background light of stars. This night sky background ranges between around 40 MHz for extragalactic target regions and around 300 MHz in the most luminous parts of the galactic plane. It can affect the energy threshold of observations, the sensitivity, and potentially adds to the systematic uncertainties of a measurement. This talk will explore the influence of night sky background variations on the overall background rate and the acceptance of the H.E.S.S. detector.