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Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 59: Gammaastronomie 3

T 59.8: Talk

Tuesday, March 28, 2017, 18:40–18:55, H 2

FACT - Study of the TeV Blazar 1ES 1959+650 During a High Flux State in 2016 — •Amit Shukla and Daniela Dorner for the FACT collaboration — ITPA, University of Würzburg

The nearby TeV Blazar 1ES 1959+650 (z=0. 047) is a high-peaked BL Lacertae object and one of the main sources which has been monitored at very high gamma-ray energies (VHE) by the First G-APD Cherenkov Telescope (FACT) since October 2012. This source has been known to be in a low state of flux since its outburst in 2002 and did not show much of activity during the first three years of FACT monitoring. However, the source started showing enhanced activity in VHE gamma-rays during summer 2015 and reached a high flux state during summer of 2016. Several very bright flares were observed by FACT in June and July 2016, and four Atels were sent to alert the community. In this presentation, we will discuss the multiwaveband behavior of 1ES 1959+650 and evolution of the high state. A physics model that can explain several flaring episodes will be discussed.

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