Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies

H.E.S.S. Collaboration, H.E.S.S. and Aharonian, Felix and Mackey, Jonathan (2020) Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies. Astronomy & Astrophysics, 639. A42. ISSN 0004-6361

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Here we report the results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS 2155−304 involving Swift, NuSTAR, Fermi-LAT, and H.E.S.S. The use of these instruments allows us to cover a broad energy range, which is important for disentangling the different radiative mechanisms. The source, observed from June 2013 to October 2013, was found in a low flux state with respect to previous observations but exhibited highly significant flux variability in the X-rays. The high-energy end of the synchrotron spectrum can be traced up to 40 keV without significant contamination by high-energy emission. A one-zone synchrotron self-Compton model was used to reproduce the broadband flux of the source for all the observations presented here but failed for previous observations made in April 2013. A lepto-hadronic solution was then explored to explain these earlier observational results.

Item Type: Article
Uncontrolled Keywords: Astrophysics High-Energy Astrophysics BL Lacertae objects: individual: PKS 2155−304 astroparticle physics
Divisions: School of Cosmics Physics > Astronomy and Astrophysics
Date Deposited: 17 Jul 2020 11:42
Last Modified: 17 Jul 2020 11:42

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