The high-energy γ-ray emission of AP Librae

Abramowski A, Aharonian F, Benkhali FA, Akhperjanian AG, Anguener E, Anton G, Backes M, Balenderan S, Balzer A, Barnacka A, Becherini Y, Tjus JB, Bernlhr K, Birsin E, Bissaldi E, Biteau J, Boettcher M, Boisson C, Bolmont J, Bordas P, Brucker J, Brun F, Brun P, Bulik T, Carrigan S, Casanova S, Chadwick PM, Chalme-Calvet R, Chaves RCG, Cheesebrough A, Chretien M, Colafrancesco S, Cologna G, Conrad J, Couturier C, Cui Y, Dalton M, Daniel MK, Davids ID, Degrange B, Deil C, Dewilt P, Dickinson HJ, Djannati-Atai A, Domainko W, Drury LO, Dubus G, Dutson K, Dyks J, Dyrda M, Edwards T, Egberts K, Eger P, Espigat P, Farnier C, Fegan S, Feinstein F, Fernandes MV, Fernandez D, Fiasson A, Fontaine G, Foerster A, Fuessling M, Gajdus M, Gallant YA, Garrigoux T, Giavitto G, Giebels B, Glicenstein JF, Grondin MH, Grudzinska M, Häffner S, Hahn J, Harris J, Heinzelmann G, Henri G, Hermann G, Hervet O, Hillert A, Hinton JA, Hofmann W, Hofverberg P, Holler M, Horns D, Jacholkowska A, Jahn C, Jamrozy M, Janiak M, Jankowsky F, Jung I, Kastendieck MA, Katarzynski K, Katz U, Kaufmann S, Khelifi B, Kieffer M, Klepser S, Klochkov D, Kluzniak W, Kneiske T, Kolitzus D, Komin N, Kosack K, Krakau S, Krayzel F, Krueger PP, Laffon H, Lamanna G, Lefaucheur J, Lemiere A, Lemoine-Goumard M, Lenain JP, Lohse T, Lopatin A, Lu CC, Marandon V, Marcowith A, Marx R, Maurin G, Maxted N, Mayer M, Mccomb TJL, Mehault J, Meintjes PJ, Menzler U, Meyer M, Moderski R, Mohamed M, Moulin E, Murach T, Naumann CL, De Naurois M, Niemiec J, Nolan SJ, Oakes L, Odaka H, Ohm S, Wilhelmi EDO, Opitz B, Ostrowski M, Oya I, Panter M, Parsons RD, Arribas MP, Pekeur NW, Pelletier G, Perez J, Petrucci PO, Peyaud B, Pita S, Poon H, Puehlhofer G, Punch M, Quirrenbach A, Raab S, Raue M, Reichardt I, Reimer A, Reimer O, Renaud M, De Los Reyes R, Rieger F, Rob L, Romoli C, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Sahakian V, Sanchez DA, Santangelo A, Schlickeiser R, Schuessler F, Schulz A, Schwanke U, Schwarzburg S, Schwemmer S, Sol H, Spengler G, Spies F, Stawarz L, Steenkamp R, Stegmann C, Stinzing F, Stycz K, Sushch I, Tavernet JP, Tavernier T, Taylor AM, Terrier R, Tluczykont M, Trichard C, Valerius K, van Eldik C, Van Soelen B, Vasileiadis G, Venter C, Viana A, Vincent P, Voelk HJ, Volpe F, Vorster M, Vuillaume T, Wagner SJ, Wagner P, Wagner RM, Ward M, Weidinger M, Weitzel Q, White R, Wierzcholska A, Willmann P, Wörnlein A, Wouters D, Yang R, Zabalza V, Zacharias M, Zdziarski AA, Zech A, Zechlin HS, Finke J, Fortin P, Horan D (2015)


Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2015

Journal

Publisher: EDP Sciences

Book Volume: 573

Article Number: A31

DOI: 10.1051/0004-6361/201321436

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.

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How to cite

APA:

Abramowski, A., Aharonian, F., Benkhali, F.A., Akhperjanian, A.G., Anguener, E., Anton, G.,... Horan, D. (2015). The high-energy γ-ray emission of AP Librae. Astronomy & Astrophysics, 573. https://doi.org/10.1051/0004-6361/201321436

MLA:

Abramowski, A., et al. "The high-energy γ-ray emission of AP Librae." Astronomy & Astrophysics 573 (2015).

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