Broadband multi-wavelength campaign on PKS 2005-489

TL;DR

This paper reports on a comprehensive multi-wavelength observational campaign of PKS 2005-489 during a high emission state, covering UV to TeV energies to analyze its broadband spectral energy distribution and emission mechanisms.

Contribution

First simultaneous multi-wavelength campaign covering UV to TeV for PKS 2005-489, providing detailed insights into its high state emission processes.

Findings

PKS 2005-489 was in a high emission state across all observed wavebands.

The campaign captured the SED peaks in UV-X-ray and GeV-TeV regimes.

Data enables detailed modeling of emission mechanisms during high activity.

Abstract

The spectral energy distribution (SED) of high-frequency peaked BL Lac objects (HBL) is characterized by two peaks: one in the UV-X-ray and one in the GeV-TeV regime. An interesting object for analyzing these broadband characteristics is PKS 2005-489, which in 2004 showed the softest TeV spectrum ever measured. In 2009, a multi-wavelength campaign has been conducted with, for the first time, simultaneous observations by H.E.S.S. (TeV), Fermi/LAT (GeV), RXTE (keV), Swift (keV, UV, optical) and ATOM (optical) to cover the two peaks of the SED. During this campaign PKS 2005-489 underwent a high state in all wavebands which gives the opportunity to study in detail the emission processes of a high state of this interesting HBL.