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Type: Journal article
Title: The high-energy γ-ray emission of AP Librae
Other Titles: The high-energy gamma-ray emission of AP Librae
Author: Abramowski, A.
Aharonian, F.
Ait Benkhali, F.
Akhperjanian, A.
Angüner, E.
Anton, G.
Backes, M.
Balenderan, S.
Balzer, A.
Barnacka, A.
Becherini, Y.
Becker Tjus, J.
Bernlöhr, K.
Birsin, E.
Bissaldi, E.
Biteau, J.
Böttcher, M.
Boisson, C.
Bolmont, J.
Bordas, P.
et al.
Citation: Astronomy and Astrophysics: a European journal, 2015; 573:A31-1-A31-7
Publisher: EDP Sciences
Issue Date: 2015
ISSN: 0004-6361
Statement of
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
DOI: 10.1051/0004-6361/201321436
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