dc.contributor.author | Abramowski, A. | |
dc.contributor.author | Böttcher, M. | |
dc.contributor.author | Casanova, S. | |
dc.contributor.author | Davids, I.D. | |
dc.contributor.author | Krüger, P.P. | |
dc.contributor.author | Pekeur, N.W. | |
dc.contributor.author | Sushch, I. | |
dc.contributor.author | Venter, C. | |
dc.contributor.author | Vorster, M. | |
dc.contributor.author | H.E.S.S. Collaboration | |
dc.date.accessioned | 2016-08-25T13:06:31Z | |
dc.date.available | 2016-08-25T13:06:31Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Abramowski, A. et al. 2015. The high-energy γ-ray emission of AP Librae. Astronomy & astrophysics, 573: Article no A31. [https://doi.org/10.1051/0004-6361/201321436] | en_US |
dc.identifier.issn | 0004-6361 | |
dc.identifier.issn | 1432-0746 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/18406 | |
dc.identifier.uri | https://doi.org/10.1051/0004-6361/201321436 | |
dc.identifier.uri | https://www.aanda.org/articles/aa/abs/2015/01/aa21436-13/aa21436-13.html | |
dc.description.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 ± 1.5stat ± 1.8sys) × 10-12 cm-2 s-1 above 130 GeV and a spectral index of Γ = 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 | en_US |
dc.language.iso | en | en_US |
dc.publisher | EDP Sciences | en_US |
dc.subject | BL Lacertae objects: individual: AP Librae | en_US |
dc.subject | galaxies: active | en_US |
dc.subject | gamma rays: galaxies | en_US |
dc.title | The high-energy γ-ray emission of AP Librae | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 24420530 - Böttcher, Markus | |
dc.contributor.researchID | 23909196 - Casanova, Sabrina | |
dc.contributor.researchID | 13146629 - Davids, Isak Delberth | |
dc.contributor.researchID | 11749903 - Krüger, Petrus Paulus | |
dc.contributor.researchID | 22050574 - Pekeur, Nicolette Whilna | |
dc.contributor.researchID | 24922986 - Sushch, Iurii | |
dc.contributor.researchID | 12006653 - Venter, Christo | |
dc.contributor.researchID | 12792322 - Vorster, Michael Johannes | |