Multiwavelength campaign on the HBL PKS 2155-304 : A new insight on its spectral energy distribution

TL;DR

This multiwavelength campaign on PKS 2155-304 significantly expanded the spectral energy distribution coverage from X-ray to gamma-ray energies, providing new insights into its emission mechanisms.

Contribution

The study presents new, comprehensive spectral data across multiple wavelengths, improving understanding of PKS 2155-304's emission properties with unprecedented gamma-ray coverage.

Findings

Extended X-ray spectrum to higher energies with NuSTAR.

Enhanced gamma-ray coverage with H.E.S.S. phase II and Fermi LAT.

Preliminary results offer new insights into the blazar's spectral energy distribution.

Abstract

The blazar PKS~2155-304 was the target of a multiwavelength campaign from June to October 2013 which widely improves our knowledge of its spectral energy distribution. This campaign involved the NuSTAR satellite (3-79 keV), the Fermi Large Area Telescope (LAT, 100~MeV-300~GeV) and the High Energy Stereoscopic System (H.E.S.S.) array phase II (with an energy threshold of few tens of GeV). While the observations with NuSTAR extend the X-ray spectrum to higher energies than before, H.E.S.S. phase II, together with the use of the LAT PASS 8, enhance the coverage of the $\gamma$-ray regime with an unprecedented precision. In this work, preliminary results from the multi-wavelength analysis are presented.