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|Title:||The high-energy γ-ray emission of AP Librae|
|Other Titles:||The high-energy gamma-ray emission of AP Librae|
Ait Benkhali, F.
Becker Tjus, J.
|Citation:||Astronomy and Astrophysics: a European journal, 2015; 573:A31-1-A31-7|
|H.E.S.S. collaboration ... P. de Wilt ... et. al.|
|Abstract:||The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5<inf>stat</inf> ± 1.8<inf>sys</inf>) × 10<sup>-12</sup> cm<sup>-2</sup> s<sup>-1</sup> above 130 GeV and a spectral index of Γ = 2.65 ± 0.19<inf>stat</inf> ± 0.20<inf>sys</inf>. This study also makes use of Fermi-LAT observations in the high energy (HE, E> 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the γ-ray emission in the spectral energy distribution is located below the GeV energy range.|
|Rights:||© ESO, 2014|
|Appears in Collections:||Aurora harvest 7|
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