Simultaneous observations of the blazar PKS2155-304 from Ultra-Violet to TeV 
energies

NuSTAR collaborations,; S., H.E.S.; Fermi,

doi:10.1051/0004-6361/201936900

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Simultaneous observations of the blazar PKS2155-304 from Ultra-Violet to TeV energies

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NuSTAR collaborations,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

S., H.E.S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fermi,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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NuSTAR collaborations, S., H., & Fermi (2020). Simultaneous observations of the blazar PKS2155-304 from Ultra-Violet to TeV energies. Astronomy & Astrophysics, 639, A42. doi:10.1051/0004-6361/201936900.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1C2B-A

Abstract

The results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS2155-304 involving Swift, NuSTAR, Fermi-LAT and H.E.S.S. are reported. The use of these instruments allows us to cover a broad energy range, 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.