The current generation of imaging atmospheric Cherenkov telescopes are allowing the sky to be probed with greater sensitivity than ever before in the energy range around and above 100 GeV. To minimise the systematic errors on derived fluxes a full calibration of the atmospheric properties is important given the calorimetric nature of the technique. In this paper we discuss an approach to address this problem by using a ceilometer co-pointed with the H.E.S.S. telescopes and present the results of the application of this method to a set of observational data taken on the active galactic nucleus (AGN) PKS 2155-304 in 2004.
|Original language||English (US)|
|Number of pages||10|
|State||Published - Dec 2010|
Bibliographical noteFunding Information:
The authors would like to acknowledge the support of their host institutions, and in addition we are grateful to Werner Hofmann, Michael Punch, Paula Chadwick & Michael Daniel for their helpful comments. S.N. and C.R. acknowledge support from the Science and Technology Facilities Council of the UK . G.P. acknowledges support by the German Ministry for Education and Research (BMBF) through DESY Grant 05CH5VH1/0 and DLR Grant 50OR0502 .
- Atmospheric calibration