Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Multi-messenger astronomy

T 73.9: Vortrag

Donnerstag, 2. April 2020, 18:30–18:45, H-HS X

FACT-Variability of Blazar Light Curves — •Bernd Schleicher and Daniela Dorner for the FACT collaboration — University of Würzburg, Institute for Theoretical Physics and Astrophysics, Germany

Blazars are a subtype of Active Galactic Nuclei, where the relativistic jet is pointing towards the observer. They emit radiation over the whole electromagnetic spectrum up to TeV energies and their flux can be extremely variable on timescales from minutes to years. To investigate the variability characteristics bright TeV blazars like for example Mrk 421 and Mrk 501 are used. These sources are monitored in the complete electromagnetc spectrum with instruments like FACT, Fermi-LAT, SWIFT, OVRO and several optical telescopes like KVA, BOSS and the Hans-Haffner-Sternwarte. This gives a chance to study the light curve variability over the complete electromagnetc spectrum. To quantify the variability of a light curve, often the fractional variability is used. The different detection methods, sensitivities and observation strategies of the instruments influence the properties of the light curve for every instrument. 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 like cadence, binning and the completeness of the light curve and on the other hand, the fractional variability of the two sources depending on energy, time and flux is studied.