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Type: Journal article
Title: H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354
Other Titles: H.E.S.S. discovery of very high energy gamma -ray emission from PKS 0625-354
Author: H.E.S.S. Collaboration
Abdalla, H.
Abramowski, A.
Aharonian, F.
Ait Benkhali, F.
Akhperjanian, A.G.
Andersson, T.
Angüner, E.O.
Arrieta, M.
Aubert, P.
Backes, M.
Balzer, A.
Barnard, M.
Becherini, Y.
Becker Tjus, J.
Berge, D.
Bernhard, S.
Bernlöhr, K.
Blackwell, R.
Böttcher, M.
et al.
Citation: Monthly Notices of the Royal Astronomical Society, 2018; 476(3):4187-4198
Publisher: Oxford University Press
Issue Date: 2018
ISSN: 0035-8711
Statement of
H.E.S.S. Collaboration, H. Abdalla ... R. Blackwell ... P. deWilt ... J. Hawkes ... J. Lau ... N. Maxted ... G. Rowell ... F. Voisin ... et al.
Abstract: 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 6.1σ. 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 galaxy.
Keywords: Radiation mechanisms: non-thermal; galaxies: active; galaxies: individual: PKS 0625−354; galaxies: jets; gamma-rays: galaxies
Description: Advance Access publication 2018 February 20
Rights: © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI: 10.1093/mnras/sty439
Grant ID: ARC
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