H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354
| dc.contributor.author | H.E.S.S. Collaboration, | |
| dc.contributor.author | Abdalla, H. | |
| dc.contributor.author | Abramowski, A. | |
| dc.contributor.author | Aharonian, F. | |
| dc.contributor.author | Ait Benkhali, F. | |
| dc.contributor.author | Akhperjanian, A.G. | |
| dc.contributor.author | Andersson, T. | |
| dc.contributor.author | Angüner, E.O. | |
| dc.contributor.author | Arrieta, M. | |
| dc.contributor.author | Aubert, P. | |
| dc.contributor.author | Backes, M. | |
| dc.contributor.author | Balzer, A. | |
| dc.contributor.author | Barnard, M. | |
| dc.contributor.author | Becherini, Y. | |
| dc.contributor.author | Becker Tjus, J. | |
| dc.contributor.author | Berge, D. | |
| dc.contributor.author | Bernhard, S. | |
| dc.contributor.author | Bernlöhr, K. | |
| dc.contributor.author | Blackwell, R. | |
| dc.contributor.author | Böttcher, M. | |
| dc.contributor.author | et al. | |
| dc.date.issued | 2018 | |
| dc.description | Advance Access publication 2018 February 20 | |
| 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. | |
| dc.description.statementofresponsibility | H.E.S.S. Collaboration, H. Abdalla ... R. Blackwell ... P. deWilt ... J. Hawkes ... J. Lau ... N. Maxted ... G. Rowell ... F. Voisin ... et al. | |
| dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2018; 476(3):4187-4198 | |
| dc.identifier.doi | 10.1093/mnras/sty439 | |
| dc.identifier.issn | 0035-8711 | |
| dc.identifier.issn | 1365-2966 | |
| dc.identifier.uri | http://hdl.handle.net/2440/114531 | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press | |
| dc.relation.grant | ARC | |
| dc.rights | © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society | |
| dc.source.uri | https://doi.org/10.1093/mnras/sty439 | |
| dc.subject | Radiation mechanisms: non-thermal; galaxies: active; galaxies: individual: PKS 0625−354; galaxies: jets; gamma-rays: galaxies | |
| dc.title | H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354 | |
| dc.title.alternative | H.E.S.S. discovery of very high energy gamma -ray emission from PKS 0625-354 | |
| dc.type | Journal article | |
| pubs.publication-status | Published |