dc.contributor.author | Abdalla, H. | |
dc.contributor.author | Barnard, M. | |
dc.contributor.author | Davids, I.D. | |
dc.contributor.author | Garrigoux, T. | |
dc.contributor.author | Ivascenko, A. | |
dc.contributor.author | Pekeur, N.W. | |
dc.contributor.author | Seyffert, A.S. | |
dc.contributor.author | Spanier, F. | |
dc.contributor.author | Sushch, I. | |
dc.contributor.author | Van der Walt, D.J. | |
dc.contributor.author | Van Rensburg, C. | |
dc.contributor.author | Venter, C. | |
dc.contributor.author | Wadiasingh, Z. | |
dc.contributor.author | H.E.S.S. Collaboration | |
dc.date.accessioned | 2018-09-10T11:59:57Z | |
dc.date.available | 2018-09-10T11:59:57Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Abdalla, 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.issn | 0035-8711 | |
dc.identifier.issn | 1365-2966 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/30942 | |
dc.identifier.uri | https://doi.org/10.1093/mnras/sty439 | |
dc.identifier.uri | https://academic.oup.com/mnras/article/476/3/4187/4880460 | |
dc.description.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 | en_US |
dc.language.iso | en | en_US |
dc.publisher | Oxford Univ Press | en_US |
dc.subject | Radiation mechanisms: non-thermal | en_US |
dc.subject | Galaxies: active | en_US |
dc.subject | Galaxies: individual: PKS 0625−354 | en_US |
dc.subject | Galaxies: jets | en_US |
dc.subject | Gamma-rays: galaxies | en_US |
dc.title | H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354 | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 26598973 - Abdalla, Hassan | |
dc.contributor.researchID | 20574266 - Barnard, Monica | |
dc.contributor.researchID | 13146629 - Davids, Isak Delberth | |
dc.contributor.researchID | 26909995 - Garrigoux, Tania | |
dc.contributor.researchID | 24790052 - Ivascenko, Alex | |
dc.contributor.researchID | 22050574 - Pekeur, Nicolette Whilna | |
dc.contributor.researchID | 20126999 - Seyffert, Albertus Stefanus | |
dc.contributor.researchID | 25161814 - Spanier, Felix Alexander | |
dc.contributor.researchID | 24922986 - Sushch, Iurii | |
dc.contributor.researchID | 21106266 - Van Rensburg, Carlo | |
dc.contributor.researchID | 12006653 - Venter, Christo | |
dc.contributor.researchID | 26594080 - Wadiasingh, Zorawar | |
dc.contributor.researchID | 10060499 - Van der Walt, Diederick Johannes | |