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.2018-09-202018-09-202018Monthly Notices of the Royal Astronomical Society, 2018; 476(3):4187-41980035-87111365-2966http://hdl.handle.net/2440/114531Advance Access publication 2018 February 20PKS 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.en© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical SocietyRadiation mechanisms: non-thermal; galaxies: active; galaxies: individual: PKS 0625−354; galaxies: jets; gamma-rays: galaxiesJournal article003009685510.1093/mnras/sty4390004309441000872-s2.0-85052199128419630