Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/50830
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Type: Journal article
Title: Upper limits from HESS active galactic nuclei observations in 2005-2007
Author: Aharonian, F.
Akhperjanian, A.
Barres de Almaida, U.
Bazer-Bachi, A.
Behera, B.
Beilicke, M.
Benbow, W.
Bernlohr, K.
Boisson, C.
Bolz, O.
Borrel, V.
Braun, I.
Brion, E.
Brown, A.
Buhler, R.
Bulik, T.
Busching, I.
Boutelier, T.
Carrigan, S.
Chadwick, P.
et al.
Citation: Astronomy and Astrophysics: a European journal, 2008; 478(2):387-393
Publisher: EDP Sciences
Issue Date: 2008
ISSN: 0004-6361
1432-0746
Statement of
Responsibility: 
F. Aharonian, A. G. Akhperjanian, U. Barres de Almeida, A. R. Bazer-Bachi, B. Behera ... Gavin P. Rowell ... 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. Thismakes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5stat ± 1.8sys) × 10−12 cm−2 s−1 above 130 GeV and a spectral index ofΓ = 2.65±0.19stat ± 0.20sys . 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.
Keywords: galaxies: active
gamma rays: observations
Description: Copyright © ESO 2008
Rights: © ESO 2008
DOI: 10.1051/0004-6361:20078604
Published version: http://dx.doi.org/10.1051/0004-6361:20078604
Appears in Collections:Aurora harvest 5
Chemistry and Physics publications

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