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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The γ-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
Astronomy and Astrophysics, Volume 619, Article A71, Year 2018
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Description
Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV-100 TeV) γ-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE γ-ray emitter, though its VHE flux exceeds both the extrapolation from early Fermi-LAT observations as well as expectations from a (misaligned) single-zone synchrotron-self Compton (SSC) description. The latter satisfactorily reproduces the emission from Cen A at lower energies up to a few GeV. New observations with H.E.S.S., comparable in exposure time to those previously reported, were performed and eight years of Fermi-LAT data were accumulated to clarify the spectral characteristics of the γ-ray emission from the core of Cen A. The results allow us for the first time to achieve the goal of constructing a representative, contemporaneous γ-ray core spectrum of Cen A over almost five orders of magnitude in energy. Advanced analysis methods, including the template fitting method, allow detection in the VHE range of the core with a statistical significance of 12σ on the basis of 213 hours of total exposure time. The spectrum in the energy range of 250 GeV-6 TeV is compatible with a power-law function with a photon index Γ = 2.52 ± 0.13stat ± 0.20sys. An updated Fermi-LAT analysis provides evidence for spectral hardening by ΔΓ ≃ 0.4 ± 0.1 at γ-ray energies above 2.8+1.0 -0.6 GeV at a level of 4.0σ. The fact that the spectrum hardens at GeV energies and extends into the VHE regime disfavour a single-zone SSC interpretation for the overall spectral energy distribution (SED) of the core and is suggestive of a new γ-ray emitting component connecting the high-energy emission above the break energy to the one observed at VHE energies. The absence of significant variability at both GeV and TeV energies does not yet allow disentanglement of the physical nature of this component, though a jet-related origin is possible and a simple two-zone SED model fit is provided to this end. © ESO 2018.
Authors & Co-Authors
Abdalla, Hassan
South Africa, Potchefstroom
North-west University
Abramowski, Attila
Germany, Hamburg
Universität Hamburg
Aharonian, F. A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Armenia, Yerevan
National Academy of Sciences of the Republic of Armenia
Ait Benkhali, F.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Angüner, Ekrem Oǧuzhan
Poland, Krakow
Polska Akademia Nauk Oddzial w Krakowie
Arakawa, Masanori
Japan, Tokyo
Rikkyo University
Armand, Céline
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Arrieta, M.
France, Paris
Université Psl
Backes, Michael
Namibia, Windhoek
University of Namibia
Balzer, Arnim
Netherlands, Amsterdam
Universiteit Van Amsterdam
Barnard, Monica A.
South Africa, Potchefstroom
North-west University
Becherini, Yvonne
Sweden, Vaxjo
Linnaeus University, Växjö
Becker-Tjus, Julia
Germany, Bochum
Ruhr-universitat Bochum
Berge, David
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Bernhard, Sabrina
Austria, Innsbruck
Universität Innsbruck
Bernlöhr, Konrad
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Blackwell, Rebecca
Australia, Adelaide
The University of Adelaide
Boettcher, M.
South Africa, Potchefstroom
North-west University
Boisson, Catherine
France, Paris
Université Psl
Bolmont, Julien
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Bonnefoy, Simon
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Bordas, Pol
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Bregeon, Johan
France, Montpellier
Université de Montpellier
Brun, François
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Brun, Pierre
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Bryan, Marta L.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Büchele, Matthias
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Bulk, Tomasz
Poland, Warsaw
University of Warsaw
Capasso, Massimo
Germany, Tubingen
Eberhard Karls Universität Tübingen
Caroff, Sami
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Carosi, Alessandro
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Casanova, Sabrina
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Poland, Krakow
Polska Akademia Nauk Oddzial w Krakowie
Cerruti, Matteo
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Chakraborty, Nachiketa
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Chaves, Ryan C.G.
France, Montpellier
Université de Montpellier
Chen, Andrew W.
South Africa, Johannesburg
University of the Witwatersrand
Chevalier, Jill
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Colafrancesco, Sergio
South Africa, Johannesburg
University of the Witwatersrand
Condon, Benjamin
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Conrad, Jan
Sweden, Stockholm
Albanova Universitetscentrum
Sweden, Stockholm
Wallenberg Academy
Davids, Isak Delberth
Namibia, Windhoek
University of Namibia
Decock, J.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Deil, Christoph
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Devin, Justine
France, Montpellier
Université de Montpellier
DeWilt, P.
Australia, Adelaide
The University of Adelaide
Dirson, Ludmilla
Germany, Hamburg
Universität Hamburg
Djannati-Ataï, Arache
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Donath, Axel
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Drury, L. O.C.
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Dyks, Jarosław
Poland, Warszawa
Polish Academy of Sciences
Egberts, Kathrin
Germany, Potsdam
Universität Potsdam
Emery, Gabriel
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Ernenwein, Jean Pierre
France, Marseille
Aix Marseille Université
Eschbach, Stefan
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Farnier, Christian
Sweden, Vaxjo
Linnaeus University, Växjö
Sweden, Stockholm
Albanova Universitetscentrum
Fegan, Stephen J.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Fernandes, Milton Virgílio
Germany, Hamburg
Universität Hamburg
Fiasson, Armand
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Fontaine, Gérard
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Funk, Stefan
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Füssling, Matthias
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Gabici, Stefano
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Gallant, Yves A.
France, Montpellier
Université de Montpellier
Garrigoux, Tania
South Africa, Potchefstroom
North-west University
Gaté, Florian
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Giavitto, Gianluca
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Glawion, Dorit Eisenacher
Germany, Heidelberg
Universität Heidelberg
Glicenstein, Jean François
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Gottschall, Daniel
Germany, Tubingen
Eberhard Karls Universität Tübingen
Grondin, Marie Hélène
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Hahn, Joachim
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Haupt, Maria
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Hawkes, Jarryd
Australia, Adelaide
The University of Adelaide
Heinzelmann, Götz
Germany, Hamburg
Universität Hamburg
Henri, Gilles
France, Saint Martin D'heres
Institut de Planétologie et D’astrophysique de Grenoble Ipag
Hermann, German
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hinton, James A.J.A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hofmann, Werner
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hoischen, Clemens
Germany, Potsdam
Universität Potsdam
Holch, T. L.
Germany, Berlin
Humboldt-universität zu Berlin
Holler, Markus
Austria, Innsbruck
Universität Innsbruck
Horns, Dieter
Germany, Hamburg
Universität Hamburg
Ivascenko, Alex
South Africa, Potchefstroom
North-west University
Iwasaki, Hiroyoshi
Japan, Tokyo
Rikkyo University
Jachołkowska, Agnieszka
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Jamrozy, Marek
Poland, Krakow
Uniwersytet Jagielloński
Jankowsky, David
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Jankowsky, Felix
Germany, Heidelberg
Universität Heidelberg
Jingo, Maxwell
South Africa, Johannesburg
University of the Witwatersrand
Jouvin, Léa
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Jung-Richardt, Ira V.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Kastendieck, Max Anton
Germany, Hamburg
Universität Hamburg
Katarzyński, Krzysztof
Poland, Torun
Uniwersytet Mikołaja Kopernika w Toruniu
Katsuragawa, Miho
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Katz, Ulrich F.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Kerszberg, Daniel
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Khangulyan, D.
Japan, Tokyo
Rikkyo University
Khélifi, Bruno
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
King, Johannes
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Klepser, Stefan
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Klochkov, Dmitry K.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Klužniak, Wlodzimierz
Poland, Warszawa
Polish Academy of Sciences
Komin, Nukri
South Africa, Johannesburg
University of the Witwatersrand
Kosack, Karl
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Krakau, S.
Germany, Bochum
Ruhr-universitat Bochum
Krüger, P. P.
South Africa, Potchefstroom
North-west University
Laffon, Hélène
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Lamanna, Giovanni
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Lau, James C.
Australia, Adelaide
The University of Adelaide
Lemière, Anne
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Lemoine-Goumard, Marianne
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Lenain, Jean Philippe
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Lohse, Thomas
Germany, Berlin
Humboldt-universität zu Berlin
Liu, Ruoyu
Germany, Heidelberg
Max-planck-institut Für Kernphysik
López-Coto, Rubén
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Lypova, Iryna
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Malyshev, Denys
Germany, Tubingen
Eberhard Karls Universität Tübingen
Marandon, Vincent
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Marcowith, Alexandre
France, Montpellier
Université de Montpellier
Marx, Ramin
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Maurin, Guillaume T.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Maxted, Nigel I.
Australia, Adelaide
The University of Adelaide
Australia, Sydney
Unsw Sydney
Mayer, Michael
Germany, Berlin
Humboldt-universität zu Berlin
Meintjes, Pieter J.
South Africa, Bloemfontein
University of the Free State
Meyer, Manuel S.
Sweden, Stockholm
Albanova Universitetscentrum
United States, Palo Alto
Stanford University
Mitchell, Alison M.W.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Moderski, Rafaƚ
Poland, Warszawa
Polish Academy of Sciences
Mohamed, Mahmoud
Germany, Heidelberg
Universität Heidelberg
Mohrmann, Lars
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Mora, Karen Salomé Caballero
Sweden, Stockholm
Albanova Universitetscentrum
Moulin, E.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Murach, Thomas
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
de Naurois, Mathieu
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Ndiyavala, Hambeleleni
South Africa, Potchefstroom
North-west University
Niemiec, Jacek
Poland, Krakow
Polska Akademia Nauk Oddzial w Krakowie
O'Brien, Paul T.
United Kingdom, Leicester
University of Leicester
Ohm, Stefan
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Ostrowski, Michałl
Poland, Krakow
Uniwersytet Jagielloński
Oya, Igor
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Padovani, Marco
France, Montpellier
Université de Montpellier
Panter, M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Parsons, Robert Daniel
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Pekeur, Nikki W.
South Africa, Potchefstroom
North-west University
Pelletier, Guy
France, Saint Martin D'heres
Institut de Planétologie et D’astrophysique de Grenoble Ipag
Petrucci, Pierre Olivier
France, Saint Martin D'heres
Institut de Planétologie et D’astrophysique de Grenoble Ipag
Pita, Santiago
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Poireau, Vincent
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Prokhorov, Dmitry A.
Sweden, Vaxjo
Linnaeus University, Växjö
South Africa, Johannesburg
University of the Witwatersrand
Prokoph, Heike
Netherlands, Amsterdam
Fom-institute of Subatomic Physics - Nikhef
Pûhlhofer, Gerd
Germany, Tubingen
Eberhard Karls Universität Tübingen
Punch, Michael
Sweden, Vaxjo
Linnaeus University, Växjö
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Quirrenbach, Andreas
Germany, Heidelberg
Universität Heidelberg
Reimer, Anita
Austria, Innsbruck
Universität Innsbruck
Reimer, Olaf
Austria, Innsbruck
Universität Innsbruck
Renaud, Matthieu
France, Montpellier
Université de Montpellier
De Los Reyes, Raquel R.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Rieger, Frank M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Germany, Heidelberg
Universität Heidelberg
Rowell, Gavin P.
Australia, Adelaide
The University of Adelaide
Rudak, Bronisław
Poland, Warszawa
Polish Academy of Sciences
Sahakian, Vardan H.
Armenia, Yerevan
National Academy of Sciences of the Republic of Armenia
Armenia, Yerevan
Yerevan Physics Institute
Sánchez, David A.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Santangelo, Andrea E.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Sasaki, Manami
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Schüssler, Fabian
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Schwanke, Ullrich
Germany, Berlin
Humboldt-universität zu Berlin
Seyffert, Albertus S.
South Africa, Potchefstroom
North-west University
Shafi, Nebiha
South Africa, Johannesburg
University of the Witwatersrand
Shilon, Idan
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Shiningayamwe, K.
Namibia, Windhoek
University of Namibia
Sol, Hélène
France, Paris
Université Psl
Spanier, Felix
South Africa, Potchefstroom
North-west University
Steenkamp, R.
Namibia, Windhoek
University of Namibia
Stegmann, Christian
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Germany, Potsdam
Universität Potsdam
Steppa, Constantin
Germany, Potsdam
Universität Potsdam
Sushch, Iurii
South Africa, Potchefstroom
North-west University
Takahashi, Tadayuki
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Tavernet, Jean Paul
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Terrier, Régis
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Tibaldo, Luigi
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Tluczykont, Martin
Germany, Hamburg
Universität Hamburg
Tuffs, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Uchiyama, Yasunobu
Japan, Tokyo
Rikkyo University
Van Der Walt, D. J.
South Africa, Potchefstroom
North-west University
Van Eldik, Christopher
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
van Rensburg, Carlo
South Africa, Potchefstroom
North-west University
van Soelen, Brian V.A.N.
South Africa, Bloemfontein
University of the Free State
Vasileiadis, Georges
France, Montpellier
Université de Montpellier
Venter, C.
South Africa, Potchefstroom
North-west University
Viana, Aion A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Brazil, Sao Paulo
Universidade de São Paulo
Vincent, P.
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Vink, Jacco S.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Voisin, Fabien J.
Australia, Adelaide
The University of Adelaide
Völk, Heinrich J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Wadiasingh, Zorawar
South Africa, Potchefstroom
North-west University
Wagner, Stefan J.
Germany, Heidelberg
Universität Heidelberg
Wagner, Philipp
Germany, Berlin
Humboldt-universität zu Berlin
White, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Wierzcholska, Alicja
Poland, Krakow
Polska Akademia Nauk Oddzial w Krakowie
Wouters, Denis
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Yang, Ruizhi
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Zaborov, Dmitry N.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Zacharias, Michael
South Africa, Potchefstroom
North-west University
Zanin, Roberta
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Zdziarski, Andrzej A.
Poland, Warszawa
Polish Academy of Sciences
Zech, Andreas
France, Paris
Université Psl
Z̀ywucka, Natalia
Poland, Krakow
Uniwersytet Jagielloński
Magill, Jeffrey D.
United States, College Park
University of Maryland, College Park
Buson, Sara
United States, Washington, D.c.
National Aeronautics and Space Administration
Cheung, Chi C.Teddy
United States, Washington, D.c.
U.s. Naval Research Laboratory
Perkins, Jeremy S.
United States, Washington, D.c.
National Aeronautics and Space Administration
Tanaka, Yasuyuki T.
Japan, Higashihiroshima
Hiroshima University
Statistics
Citations: 35
Authors: 211
Affiliations: 45
Identifiers
Doi:
10.1051/0004-6361/201832640
ISSN:
00046361
Research Areas
Environmental