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

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.

15 pages, 4 figures

References in corpus (14)

• Fermi Large Area Telescope Fourth Source Catalog
• Observations of the Crab Nebula with H.E.S.S
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• On the origin of the hard X-Ray excess of high-synchrotron-peaked BL Lac object Mrk 421
• XMM-Newton observations of the TeV BL Lac object PKS 2155--304 in 2006: signature of inverse Compton X-ray emission?
• Infrared to X-ray observations of PKS 2155-304 in a low state
• Modelling rapid TeV variability of PKS 2155-304
• Variability studies and modeling of the blazar PKS 2155-304 in the light of a decade of multi-wavelength observations
• The Hard X-ray emission of the blazar PKS 2155--304

Cited by in corpus (7)

• Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and $\gamma$-ray activity in 2015$-$2016
• Multiwavelength variability power spectrum analysis of the blazars 3C 279 and PKS 1510-089 on multiple timescales
• Correlation between optical and $\gamma$-ray flux variations in BL Lacs
• Two-injection scenario for the hard X-ray excess observed in Mrk 421
• Convex X-ray Spectra of PKS 2155-304 and Constraints on the Minimum Electron Energy
• H.E.S.S.: The High Energy Stereoscopic System
• 20 years of monitoring: PKS 2155-304 and PKS 1510-089 in the eyes of Swift and Fermi. I. The case of PKS 2155-304