Is PKS 0625-354 another variable TeV active galactic nucleus?

Discussion timeslot (ZOOM-Meeting): 15. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/98542982538
ZOOM-Meeting ID: 98542982538
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/49-Studying-the-variable-emission-from-AGN-in-a-multi-wavelength-context-GAD-GAI-MM/119
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-04/5

Abstract:
'The majority of the active galactic nuclei detected at very-high-energies above 100 GeV belong to the class of blazars with a small angle between the jet-axis and the line-of-sight. Only about 10 percent of the gamma-ray AGN are objects with a larger viewing angle resulting in a smaller Doppler boosting of the emission. Originally, it was believed that gamma-ray emission can only be observed from blazars and those are variable in its brightness. Instead, the last years have shown that non-blazar active galaxies also show a fascinating variability behaviour which provide important new insights into the physical processes responsible for the gamma-ray production and especially for flaring events.rnrnHere, we report on the observation of gamma-ray variability of the active galaxy PKS 0625-354 detected with the H.E.S.S. telescopes in November 2018. The classification of PKS 0625-354 is a still matter of debate. The H.E.S.S. measurements were performed as part of a flux monitoring program and showed in the first night of the observation a detection of the object within one observation run of 30 minutes. A denser observation campaign followed for the next nine nights resulting in a decrease of the gamma-ray flux. Those observations were accompanied with Swift and ATOM measurements in the X-ray and UV/optical band allowing for the reconstruction of the first simultaneous broad-band spectral energy distribution. We will discuss the implications of the gamma-ray variability of the object as well as the spectral energy distribution.'

Authors: Dorit Glawion
Co-Authors: Alicja Wierzcholska | for the H.E.S.S. Collaboration
Collaboration: H.E.S.S.

Indico-ID: 513
Proceeding URL: https://pos.sissa.it/395/814