文章基本信息

标题：Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies
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作者：H. Abdalla ; R. Adam ; F. Aharonian 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：639
页码：1-13
DOI：10.1051/0004-6361/201936900
语种：English
出版社：EDP Sciences
摘要：Here we report the results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS 2155−304 involvingSwift,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.
关键词：enBL Lacertae objects: individual: PKS 2155−304astroparticle physics