H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354

H.E.S.S. Collaboration

doi:10.1093/mnras/sty439

H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354

H.E.S.S. Collaboration

North-West University
Universität Hamburg
Max-Planck-Institut für Kernphysik
Dublin Institute for Advanced Studies
National Academy of Sciences of Armenia
Yerevan Physics Institute
Linnaeus University, Växjö
Humboldt-Universität zu Berlin
Sorbonne Univ.
Université Savoie Mont Blanc
University of Namibia
University of Amsterdam
Ruhr-University Bochum
University of Innsbruck
University of Adelaide
Sorbonne Université
Laboratoire Univers et Particules de Montpellier
Univ. Bordeaux
Institut Pierre Simon Laplace, CNRS and CEA
University of Warsaw
University of Tübingen
Aix Marseille Université
Institute for Nuclear Physics
University of the Witwatersrand, Johannesburg
Landessternwarte Heidelberg
Stockholm University
Astroparticule and Cosmol APC
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of Leicester
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
University of Potsdam
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
c/o DESY
Jagiellonian University
University of California, Santa Cruz
Nicolaus Copernicus University
University of the Free State
University of Heidelberg
University of Amsterdam
Rikkyo University

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

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 G = 2.84 ± 0.50_stat ± 0.10_syst and normalization (at E₀ = 1.0 TeV) N₀(E₀)=(0.58±0.22_stat ±0.12_syst)×10^-12 TeV^-1 cm-2 s^-1. Multiwavelength data collected with Fermi-LAT, Swift-XRT, Swift-UVOT, ATOMand 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.

langue originale	Anglais
Pages (de - à)	4187-4198
Nombre de pages	12
journal	Monthly Notices of the Royal Astronomical Society
Volume	476
Numéro de publication	3
Les DOIs	https://doi.org/10.1093/mnras/sty439
état	Publié - 21 mai 2018

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10.1093/mnras/sty439

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@article{35875757cc47476193b6461be9b03300,

title = "H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354",

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 G = 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, ATOMand 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 = "Galaxies: active, Galaxies: individual: PKS 0625-354, Galaxies: jets, Gamma-rays: galaxies, Radiation mechanisms: non-thermal",

author = "\{H.E.S.S. Collaboration\} and H. Abdalla and A. Abramowski and F. Aharonian and \{Ait Benkhali\}, F. and Akhperjanian, \{A. G.\} and T. Andersson and Ang{\"u}ner, \{E. O.\} and M. Arrieta and P. Aubert and M. Backes and A. Balzer and M. Barnard and Y. Becherini and \{Becker Tjus\}, J. and D. Berge and S. Bernhard and K. Bernl{\"o}hr and R. Blackwell and M. B{\"o}ttcher and C. Boisson and J. Bolmont and P. Bordas and J. Bregeon and F. Brun and P. Brun and M. Bryan and T. Bulik and M. Capasso and J. Carr and S. Casanova and M. Cerruti and N. Chakraborty and R. Chalme-Calvet and Chaves, \{R. C.G.\} and A. Chen and J. Chevalier and M. Chr{\'e}tien and S. Colafrancesco and G. Cologna and B. Condon and J. Conrad and Y. Cui and Davids, \{I. D.\} and J. Decock and B. Degrange and C. Deil and J. Devin and P. deWilt and L. Dirson and S. Fegan",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s).",

year = "2018",

month = may,

day = "21",

doi = "10.1093/mnras/sty439",

language = "English",

volume = "476",

pages = "4187--4198",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

TY - JOUR

T1 - H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354

AU - H.E.S.S. Collaboration

AU - Abdalla, H.

AU - Abramowski, A.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Akhperjanian, A. G.

AU - Andersson, T.

AU - Angüner, E. O.

AU - Arrieta, M.

AU - Aubert, P.

AU - Backes, M.

AU - Balzer, A.

AU - Barnard, M.

AU - Becherini, Y.

AU - Becker Tjus, J.

AU - Berge, D.

AU - Bernhard, S.

AU - Bernlöhr, K.

AU - Blackwell, R.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - Bordas, P.

AU - Bregeon, J.

AU - Brun, F.

AU - Brun, P.

AU - Bryan, M.

AU - Bulik, T.

AU - Capasso, M.

AU - Carr, J.

AU - Casanova, S.

AU - Cerruti, M.

AU - Chakraborty, N.

AU - Chalme-Calvet, R.

AU - Chaves, R. C.G.

AU - Chen, A.

AU - Chevalier, J.

AU - Chrétien, M.

AU - Colafrancesco, S.

AU - Cologna, G.

AU - Condon, B.

AU - Conrad, J.

AU - Cui, Y.

AU - Davids, I. D.

AU - Decock, J.

AU - Degrange, B.

AU - Deil, C.

AU - Devin, J.

AU - deWilt, P.

AU - Dirson, L.

AU - Fegan, S.

PY - 2018/5/21

Y1 - 2018/5/21

N2 - 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 G = 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, ATOMand 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.

AB - 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 G = 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, ATOMand 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.

KW - Galaxies: active

KW - Galaxies: individual: PKS 0625-354

KW - Galaxies: jets

KW - Gamma-rays: galaxies

KW - Radiation mechanisms: non-thermal

U2 - 10.1093/mnras/sty439

DO - 10.1093/mnras/sty439

M3 - Article

AN - SCOPUS:85052199128

SN - 0035-8711

VL - 476

SP - 4187

EP - 4198

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

H.E.S.S. discovery of very high energy γ -ray emission from PKS 0625-354

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