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T: Fachverband Teilchenphysik
T 73: Gammaastronomie 4
T 73.9: Talk
Wednesday, March 26, 2014, 18:50–19:05, P2
New method for correcting Cherenkov telescope energy spectra for variable atmospheric transmission by using LIDAR measurements — •Christian Fruck1, Markus Gaug2, Jürgen Hose1, Miquel Cassanyes2, Lluís Font2, Razmik Mirzoyan1, and Masahiro Teshima1 for the MAGIC collaboration — 1Max-Planck-Institut für Physik, München, Germany — 2Universitat Autònoma de Barcelona, Barcelona, Spain
Over the past 20 years, Imaging Air-shower Cherenkov Telescopes (IACTs) have opened a new observational window to the most energetic processes in the Universe. But at the TeV energy scale, long integration times are necessary in order to accumulate enough events for significant detections and accurate energy spectral determinations. With the atmosphere being part of the detector, adverse atmospheric conditions like clouds or aerosols can reduce the usable amount of data by a significant fraction. In this talk, a simple method will be presented to extract cloud/aerosol transmission profiles from single wavelength micro-Joule LIDAR data, and to do event by event corrections to IACT data. In the conference I will show, using data from the MAGIC telescopes, that such information can be used to recover energy spectra of TeV sources recorded during adverse observational conditions and how future application of this technique could increase the effective observation time of IACTs.