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Conference Paper

Ensuring long-term stability of data quality selection for H.E.S.S. under challenging atmoshperic conditions

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30555

Hahn,  Joachim
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30395

De los Reyes,  Raquel
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30300

Bernlöhr,  Konrad
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30391

Deil,  Christoph
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

Marandon,  Vincent
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Hahn, J., De los Reyes, R., Bernlöhr, K., Deil, C., Gast, H., Kosack, K., et al. (2012). Ensuring long-term stability of data quality selection for H.E.S.S. under challenging atmoshperic conditions. In Proceedings of the 5th International Meeting on High Energy Gamma-Ray Astronomy (pp. 721-724). AIP.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-EB14-C
Abstract
Imaging atmospheric Čerenkov telescopes are complex instruments that use Earth's atmosphere as an integral part of the detector system. For the eight years of observations with the High Energy Stereoscopic System (H.E.S.S.) in Namibia, we study the long-term behaviour of the quality criteria used to select data taken under good atmospheric conditions and in the absence of hardware problems. The overall yield in Čerenkov photons varies strongly with time for H.E.S.S., due to degradation of mirrors and natural and man-made variations of atmospheric transparency, on time scales from hours to seasons. We present robust cuts that cope with these effects over the full dataset of H.E.S.S. and examine the influence of the cuts on energy reconstruction and spectral parameters.