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T: Fachverband Teilchenphysik

T 39: Gamma-Astronomie I

T 39.4: Vortrag

Dienstag, 26. März 2019, 16:55–17:10, S14

FACT - Studying Blazar Variability — •Bernd Schleicher for the FACT Collaboration collaboration — Universität Würzburg

The First G-APD Cherenkov Telescope (FACT) is monitoring a small sample of high energy gamma-ray sources. Active Galactic Nuclei emit radiation over the whole electromagnetic spectrum up to TeV energies. Blazars are one subtype with their jets pointing towards the observer. One of their typical features is extreme variability on timescales from minutes to years. To quantify the variability of a light curve, often the fractional variability is used. To study blazar variability depending on energy and time, FACT data are combined with public multi-wavelength data from other instruments in various energy ranges. Different detection methods and sensitivities of the instruments result in different cadence and time binning of the data sets. The effect of these differences on the fractional variability needs to be studied and taken into account for the physics interpretation. On the one hand, systematic effects of cadence and time binning are investigated. On the other hand, the fractional variability is studied depending on energy and time.