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dc.contributor.authorAbdalla, H.
dc.contributor.authorBarnard, M.
dc.contributor.authorDavids, I.D.
dc.contributor.authorGarrigoux, T.
dc.contributor.authorIvascenko, A.
dc.contributor.authorPekeur, N.W.
dc.contributor.authorSeyffert, A.S.
dc.contributor.authorSpanier, F.
dc.contributor.authorSushch, I.
dc.contributor.authorVan der Walt, D.J.
dc.contributor.authorVan Rensburg, C.
dc.contributor.authorVenter, C.
dc.contributor.authorWadiasingh, Z.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2018-09-10T11:59:57Z
dc.date.available2018-09-10T11:59:57Z
dc.date.issued2018
dc.identifier.citationAbdalla, H. et al. 2018. H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354. Monthly notices of the Royal Astronomical Society, 476(3):4187-4198. [https://doi.org/10.1093/mnras/sty439]en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/30942
dc.identifier.urihttps://doi.org/10.1093/mnras/sty439
dc.identifier.urihttps://academic.oup.com/mnras/article/476/3/4187/4880460
dc.description.abstractPKS 0625−354 (z = 0.055) was observed with the four High Energy Stereoscopic System (H.E.S.S.) telescopes in 2012 during 5.5 h. The source was detected above an energy threshold of 200 GeV at a significance level of 6.1σ. No significant variability is found in these observations. The source is well described with a power-law spectrum with photon index Γ = 2.84 ± 0.50stat ± 0.10syst and normalization (at E0 = 1.0 TeV) N0(E0) = (0.58 ± 0.22stat ± 0.12syst) × 10−12 TeV−1 cm−2 s−1. Multiwavelength data collected with Fermi-LAT, Swift-XRT, Swift-UVOT, ATOM and WISE are also analysed. Significant variability is observed only in the Fermi-LAT γ-ray and Swift-XRT X-ray energy bands. Having a good multiwavelength coverage from radio to very high energy, we performed a broad-band modelling from two types of emission scenarios. The results from a one zone lepto-hadronic and a multizone leptonic models are compared and discussed. On the grounds of energetics, our analysis favours a leptonic multizone model. Models associated to the X-ray variability constraint support previous results, suggesting a BL Lac nature of PKS 0625−354 with, however, a large-scale jet structure typical of a radio galaxyen_US
dc.language.isoenen_US
dc.publisherOxford Univ Pressen_US
dc.subjectRadiation mechanisms: non-thermalen_US
dc.subjectGalaxies: activeen_US
dc.subjectGalaxies: individual: PKS 0625−354en_US
dc.subjectGalaxies: jetsen_US
dc.subjectGamma-rays: galaxiesen_US
dc.titleH.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354en_US
dc.typeArticleen_US
dc.contributor.researchID26598973 - Abdalla, Hassan
dc.contributor.researchID20574266 - Barnard, Monica
dc.contributor.researchID13146629 - Davids, Isak Delberth
dc.contributor.researchID26909995 - Garrigoux, Tania
dc.contributor.researchID24790052 - Ivascenko, Alex
dc.contributor.researchID22050574 - Pekeur, Nicolette Whilna
dc.contributor.researchID20126999 - Seyffert, Albertus Stefanus
dc.contributor.researchID25161814 - Spanier, Felix Alexander
dc.contributor.researchID24922986 - Sushch, Iurii
dc.contributor.researchID21106266 - Van Rensburg, Carlo
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID26594080 - Wadiasingh, Zorawar
dc.contributor.researchID10060499 - Van der Walt, Diederick Johannes


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