A method to correct IACT data for atmospheric absorption due to the Saharan Air Layer

Details A method to correct IACT data for atmospheric absorption due to the Saharan Air Layer A method to correct IACT data for atmospheric absorption due to the Saharan Air Layer

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..677d&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

Astronomical And Space-Research Instrumentation, Gamma-Ray, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

Using the atmosphere as a detector volume, Imaging Air Cherenkov Telescopes (IACTs) depend highly on the properties and the condition of the air mass above the telescope. On the Canary Island of La Palma, where the Major Atmospheric Gamma-ray Imaging Cherenkov telescope (MAGIC) is situated, the Saharan Air Layer (SAL) can cause strong atmospheric absorption affecting the data quality and resulting in a reduced gamma flux. Therefore, a method to correct the data for the effect of the SAL is required. Three different measurements of the atmospheric absorption are performed on La Palma. From the determined transmission, a correction factor is calculated and applied to the MAGIC data. The different transmission measurements from optical and IACT data provide comparable results. MAGIC data of PG 1553+113, taken during a MWL campaign in July 2006, were analyzed using the presented method, providing a corrected flux measurement for the study of the spectral energy distribution of the source.

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