Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 57: Gamma Astronomy I

T 57.2: Vortrag

Mittwoch, 2. April 2025, 16:30–16:45, VG 3.101

Longterm Variability Study of the Crab Nebula with the MAGIC Telescopes — Felix Wersig and •Cyrus Walther — TU Dortmund, Germany

As the brightest steady source in the sky at very high energies, the Crab Nebula is often used for the calibration of instruments in gamma astronomy. Since 2011 multiple flares at energies > 100 MeV have been observed by AGILE and Fermi-LAT. We investigate variability at very high energies using data spanning a time period of 10 years from the MAGIC telescopes. Non-periodic variability can manifests in three ways: flares, flux increase/decrease on long-timescales or as an additional fluctuation on top of the statistical fluctuations expected in the flux. To investigate those types of variability, different tests are implemented.The presence of flares is investigated with a Bayesian Blocks algorithm, changes of the flux on long time-scales are investigated with a likelihood ratio test and the fractional variation is introduced as test statistic for a model independent test for fluctuations in the data.

Keywords: Crab Nebula; Variability; Galactic