Presentation #100.76 in the session AGN.
PKS 2005−489 is a well-known, bright southern BL Lac object and has been detected across the EM spectrum, from the radio band up to TeV energies. In a low-flux state it exhibits the expected multiwavelength double-peaked spectrum in the radio – γ-ray band. The high-flux state shows extreme flux variations in the X-ray band with a hardening as well as a peculiar curved feature in the spectrum. Thus far, PKS 2005−489 is the only AGN to exhibit such a feature. To study the X-ray variability further, we obtained the first hard X-ray spectrum of the source with NuSTAR. We compare quasi-simultaneous data of PKS 2005−489 to archival data in order to study its broadband behavior. We find a very consistent quiet state in the SED, with little variation in spectral shape or flux between the 2012 and 2020 data.
A possible explanation for the peculiar X-ray spectrum in the flaring state is an additional component in the jet, possibly accelerated via magnetic reconnection, that is not co-spatial to the low-flux state emission region.