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HESS discovery of very high energy gamma-ray emission from PKS 0625-354
North-West University, South Africa.
University of Hamburg, Germany.
Max Planck Institute for Nuclear Physics, Germany ; Dublin Institute for Advanced Studies, Ireland ; National Academy of Sciences of the Republic of Armenia, Armenia.
Max Planck Institute for Nuclear Physics, Germany.
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2018 (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
Oxford University Press, 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
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-76771DOI: 10.1093/mnras/sty439ISI: 000430944100087Scopus ID: 2-s2.0-85052199128OAI: oai:DiVA.org:lnu-76771DiVA, id: diva2:1232355
Available from: 2018-07-11 Created: 2018-07-11 Last updated: 2019-08-29Bibliographically approved

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Becherini, YvonneFarnier, ChristianProkhorov, DmitryProkoph, HeikePunch, Michael

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Becherini, YvonneFarnier, ChristianProkhorov, DmitryProkoph, HeikePunch, Michael
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Department of Physics and Electrical Engineering
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Monthly notices of the Royal Astronomical Society
Astronomy, Astrophysics and Cosmology

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