Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 65: Experimentelle Techniken der Astroteilchenphysik 4

T 65.6: Vortrag

Dienstag, 28. März 2017, 18:00–18:15, S 055

FACT - Time series analysis of unevenly sampled data — •Max Mahlke and Thomas Bretz for the FACT collaboration — III. Physikalisches Institut A, RWTH Aachen University, Aachen, Germany

The light curves of astrophysical sources are the result of numerous
underlying processes taking place simultaneously. The apparent complexity in the time-domain can be disentangled in the frequency-domain by successive application of statistical methods. As the light curves typically contain gaps due to factors such as bad weather and source visibility, the methods have to be suitable for unevenly spaced data. Arising systematic features in the spectra are reduced by iterative deconvolution with the spectral window. The significance of true peaks in the noisy background is assessed with bootstrapping and harmonic filters.

Blazars like Markarian (Mrk) 501 are hosts to various high-energy phenomena. Therefore, the light curves promise to contain interesting features in their power spectra. In the particular case of Mrk 501, a 23-day periodicity has been claimed in the past.

Among other sources, the First G-APD Cherenkov Telescope (FACT) has been monitoring Mrk 501 and Mrk 421 for the past five years. The light curves are subjected to the described time series analysis in the search for both systematic and source periodicities.