Journal
ASTRONOMY & ASTROPHYSICS
Volume 573, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321436
Keywords
galaxies: active; BL Lacertae objects: individual: AP Librae; gamma rays: galaxies
Categories
Funding
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- French Ministry for Research
- Astroparticle Interdisciplinary Programme of the CNRS [CNRS-IN2P3]
- UK. Particle Physics and Astronomy Research Council (PPARC)
- IPNP of the Charles University
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- INAF in Italy
- CNES in France
- Fermi LAT
- Science and Technology Facilities Council [PP/E001319/1, ST/L00075X/1] Funding Source: researchfish
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The gamma-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) gamma-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 +/- 1.5(stat) +/- 1.8(sys)) x 10(-12) cm(-2) s(-1) above 130 GeV and a spectral index of Gamma = 2.65 +/- 0.19(stat) +/- 0.20(sys). 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 gamma-ray emission in the spectral energy distribution is located below the GeV energy range.
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