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Simultaneous observations of the blazar PKS 2155-304 from ultra-violet to TeV energies
North West Univ, South Africa.
Inst Polytech Paris, France.
Max Planck Inst Kernphys, Germany;Dublin Inste Adv Studies, Ireland;RAU, Armenia.
Max Planck Inst Kernphys, Germany.
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2020 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 639, p. 1-13, article id A42Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
EDP Sciences, 2020. Vol. 639, p. 1-13, article id A42
Keywords [en]
BL Lacertae objects: individual: PKS 2155-304, astroparticle physics
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-97719DOI: 10.1051/0004-6361/201936900ISI: 000550675400002Scopus ID: 2-s2.0-85092032511OAI: oai:DiVA.org:lnu-97719DiVA, id: diva2:1461789
Available from: 2020-08-27 Created: 2020-08-27 Last updated: 2024-11-22Bibliographically approved

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Becherini, YvonneBylund, TomasPunch, MichaelSenniappan, Mohanraj

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Becherini, YvonneBylund, TomasPunch, MichaelSenniappan, Mohanraj
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