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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Abstract
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 |
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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: | 20 Dec 2022 09:02 |
URI: | https://dair.dias.ie/id/eprint/1100 |
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