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HESS discovery of very high energy gamma-ray emission from PKS 0625-354
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Linnaeus University, Sweden.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 2552018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 476, no 3, p. 4187-4198Article in journal (Refereed) Published
Abstract [en]

PKS 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 6.1 sigma. No significant variability is found in these observations. The source is well described with a power-law spectrum with photon index Gamma = 2.84 +/- 0.50(stat) +/- 0.10(syst) and normalization (at E-0 = 1.0 TeV) N-0(E-0)=(0.58 +/- 0.22(stat) +/- 0.12(syst)) x 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 gamma-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 galaxy.

Place, publisher, year, edition, pages
2018. Vol. 476, no 3, p. 4187-4198
Keywords [en]
radiation mechanisms: non-thermal, galaxies: active, galaxies: individual: PKS 0625-354, galaxies: jets, gamma-rays: galaxies
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156641DOI: 10.1093/mnras/sty439ISI: 000430944100087OAI: oai:DiVA.org:su-156641DiVA, id: diva2:1215003
Available from: 2018-06-07 Created: 2018-06-07 Last updated: 2018-06-07Bibliographically approved

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Conrad, Jan M.Farnier, ChristianMeyer, ManuelMorå, KnutSpengler, GerritWagner, Robert M.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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