Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 58: Gamma astronomy I

T 58.2: Vortrag

Mittwoch, 17. März 2021, 16:20–16:35, Th

The Intermittently Extreme Behaviour of the High-peaked BL Lac Type Blazar 1ES 2344+514 — •Axel Arbet-Engels¹, Daniela Dorner², and Marina Manganaro for the FACT and MAGIC Collaborations³ — ¹ETH Zürich, Switzerland — ²Universität Würzburg, Würzburg, Germany — ³University of Rijeka, Rijeka, Croatia

MAGIC and FACT investigate the very-high-energy (E>100GeV) gamma rays emitted by BL Lac type objects, which are active galactic nuclei with a relativistic jet pointing towards the observer. Past observations have revealed that the VHE emitting BL Lac type object 1ES2344+514 shows strong flux variability and the spectral energy distribution shifts towards unusually high energies during active states. Previous studies show that the synchrotron component could reach a peak frequency above 1 keV during some past flares, making it a member of the extreme high-peaked BL Lac family. We present results of a dense multi-wavelength observing campaign during a flaring event of 1ES2344+514 in August 2016. The VHE flux measured by MAGIC and FACT is comparable to the historical maximum observed in 1995 by Whipple. The X-ray spectrum is hard with a shift of the synchrotron peak frequency by more than an order of magnitude with respect to low activity states, implying an intermittent extreme high-peaked BL Lac behaviour. Combining multi-wavelength observations, we obtain an unprecedented characterisation of the inverse Compton component during a flare. We interpret the emission within a leptonic and hadronic scenario.