1. From radio to TeV: the surprising spectral energy distribution of AP Librae.
- Author
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Sanchez, D. A., Giebels, B., Fortin, P., Horan, D., Szostek, A., Fegan, S., Baczko, A. K., Finke, J., Kadler, M. L., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., and Savolainen, T.
- Subjects
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SPECTRAL energy distribution , *X-ray emission spectroscopy , *X-ray astronomy , *LEPTONS (Nuclear physics) , *NUCLEAR astrophysics - Abstract
Following the discovery of high-energy (HE; E > 10 MeV) and very-high-energy (VHE; E > 100 GeV) γ-ray emission from the low-frequency-peaked BL Lac (LBL) object AP Librae, its electromagnetic spectrum is studied over 60 octaves in energy. Contemporaneous data in radio, optical and UV together with the (non-simultaneous) γ-ray data are used to construct the most precise spectral energy distribution of this source. The data have been found to be modelled with difficulties with single-zone homogeneous leptonic synchrotron self-Compton (SSC) radiative scenarios due to the unprecedented width of the HE component when compared to the lower-energy component. The two other LBL objects also detected at VHE appear to have similar modelling difficulties. Nevertheless, VHE γ-rays produced in the extended jet could account for the VHE flux observed by HESS. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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