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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A deep spectromorphological study of the γ -ray emission surrounding the young massive stellar cluster Westerlund 1
Astronomy and Astrophysics, Volume 666, Article A124, Year 2022
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Description
Context. Young massive stellar clusters are extreme environments and potentially provide the means for efficient particle acceleration. Indeed, they are increasingly considered as being responsible for a significant fraction of cosmic rays (CRs) that are accelerated within the Milky Way. Westerlund 1, the most massive known young stellar cluster in our Galaxy, is a prime candidate for studying this hypothesis. While the very-high-energy γ-ray source HESS J1646-458 has been detected in the vicinity of Westerlund 1 in the past, its association could not be firmly identified. Aims. We aim to identify the physical processes responsible for the γ-ray emission around Westerlund 1 and thus to understand the role of massive stellar clusters in the acceleration of Galactic CRs better. Methods. Using 164 h of data recorded with the High Energy Stereoscopic System (H.E.S.S.), we carried out a deep spectromorphological study of the γ-ray emission of HESS J1646-458. We furthermore employed H I and CO observations of the region to infer the presence of gas that could serve as target material for interactions of accelerated CRs. Results. We detected large-scale (~2 diameter) γ-ray emission with a complex morphology, exhibiting a shell-like structure and showing no significant variation with γ-ray energy. The combined energy spectrum of the emission extends to several tens of TeV, and it is uniform across the entire source region. We did not find a clear correlation of the γ-ray emission with gas clouds as identified through H I and CO observations. Conclusions. We conclude that, of the known objects within the region, only Westerlund 1 can explain the majority of the γ-ray emission. Several CR acceleration sites and mechanisms are conceivable and discussed in detail. While it seems clear that Westerlund 1 acts as a powerful particle accelerator, no firm conclusions on the contribution of massive stellar clusters to the flux of Galactic CRs in general can be drawn at this point. ©
Authors & Co-Authors
Aharonian, F. A.
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Ashkar, Halim
France, Palaiseau
Institut Polytechnique de Paris
Backes, Michael
Namibia, Windhoek
University of Namibia
South Africa, Potchefstroom
North-west University
Barbosa-Martins, V.
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Becherini, Yvonne
France, Paris
Cnrs Centre National de la Recherche Scientifique
Sweden, Vaxjo
Linnaeus University, Växjö
Berge, David
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Germany, Berlin
Humboldt-universität zu Berlin
Bi, Baiyang
Germany, Tubingen
Eberhard Karls Universität Tübingen
Boettcher, M.
South Africa, Potchefstroom
North-west University
de Bony de Lavergne, Mathieu
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Bradascio, Federica
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Brose, Robert
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Brun, François
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Bulk, Tomasz
Poland, Warsaw
University of Warsaw
Burger-Scheidlin, Christopher
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Cangemi, Floriane
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Caroff, Sami
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Casanova, Sabrina
Poland, Krakow
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Cerruti, Matteo
France, Paris
Cnrs Centre National de la Recherche Scientifique
Chand, Tej
South Africa, Potchefstroom
North-west University
Chandra, Sunil
South Africa, Potchefstroom
North-west University
Chen, Andrew W.
South Africa, Johannesburg
University of the Witwatersrand
Chibueze, O. U.
South Africa, Potchefstroom
North-west University
Cristofari, Pierre
France, Paris
Université Psl
Damascène Mbarubucyeye, Jean
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Djannati-Ataï, Arache
France, Paris
Cnrs Centre National de la Recherche Scientifique
Ernenwein, Jean Pierre
France, Marseille
Aix Marseille Université
Feijen, K.
Australia, Adelaide
The University of Adelaide
Fichet de Clairfontaine, Gaëtan
France, Paris
Université Psl
Fontaine, Gérard
France, Palaiseau
Institut Polytechnique de Paris
Funk, Stefan
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Gabici, Stefano
France, Paris
Cnrs Centre National de la Recherche Scientifique
Gallant, Yves A.
France, Montpellier
Université de Montpellier
Ghafourizadeh, S.
Germany, Heidelberg
Universität Heidelberg
Giavitto, Gianluca
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Giunti, Luca
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Glawion, Dorit Eisenacher
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Glicenstein, Jean François
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Goswami, Pranjupriya
South Africa, Potchefstroom
North-west University
Grondin, Marie Hélène
France, Bordeaux
Université de Bordeaux
Härer, Lucia K.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Haupt, Maria
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Hinton, James A.J.A.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Hörbe, Mario
United Kingdom, Oxford
University of Oxford
Hofmann, Werner
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Holch, T. L.
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Holler, Markus
Austria, Innsbruck
Universität Innsbruck
Horns, Dieter
Germany, Hamburg
Universität Hamburg
Jamrozy, Marek
Poland, Krakow
Uniwersytet Jagielloński
Joshi, Vikas
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Jung-Richardt, Ira V.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Kasai, Eli K.
Namibia, Windhoek
University of Namibia
Katarzyński, Krzysztof
Poland, Torun
Uniwersytet Mikołaja Kopernika w Toruniu
Katz, Ulrich F.
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Khélifi, Bruno
France, Paris
Cnrs Centre National de la Recherche Scientifique
Kluźniak, W.
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
Kostunin, Dmitriy G.
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Kukec Mezek, Gašper
Sweden, Vaxjo
Linnaeus University, Växjö
Lang, Rodrigo Guedes
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Le Stum, S.
France, Marseille
Aix Marseille Université
Lemière, Anne
France, Paris
Cnrs Centre National de la Recherche Scientifique
Lemoine-Goumard, Marianne
France, Bordeaux
Université de Bordeaux
Lenain, Jean Philippe
France, Paris
Laboratoire de Physique Nucléaire et de Hautes Energies
Leuschner, Fabian
Germany, Tubingen
Eberhard Karls Universität Tübingen
Lohse, Thomas
Germany, Berlin
Humboldt-universität zu Berlin
Luashvili, Anna
France, Paris
Université Psl
Lypova, Iryna
Germany, Heidelberg
Universität Heidelberg
MacKey, Jonathan
Ireland, Dublin
Institiúid Ard-lénn Bhaile Átha Cliath
Majumdar, Jhilik
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Malyshev, Denys
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Marandon, Vincent
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Marchegiani, Paolo
South Africa, Johannesburg
University of the Witwatersrand
Marcowith, Alexandre
France, Montpellier
Université de Montpellier
Martí.-Devesa, G.
Austria, Innsbruck
Universität Innsbruck
Marx, Ramin
Germany, Heidelberg
Universität Heidelberg
Maurin, Gilles
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Meyer, Manuel S.
Germany, Hamburg
Universität Hamburg
Mitchell, Alison M.W.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Moderski, Rafaƚ
Poland, Warszawa
Polish Academy of Sciences
Mohrmann, Lars
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Montanari, Alessandro
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Moulin, Emmanuel
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Muller, Jacques
France, Palaiseau
Institut Polytechnique de Paris
Murach, Thomas
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Nakashima, Kaori
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
de Naurois, Mathieu
France, Palaiseau
Institut Polytechnique de Paris
Nayerhoda, Amid
Poland, Krakow
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Niemiec, J.
Poland, Krakow
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Ohm, Stefan
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Olivera-Nieto, Laura
Germany, Heidelberg
Max-planck-institut Für Kernphysik
De Oña Wilhelmi, Emma
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Ostrowski, Michałl
Poland, Krakow
Uniwersytet Jagielloński
Panny, Sebastian
Austria, Innsbruck
Universität Innsbruck
Panter, M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Parsons, Robert Daniel
Germany, Berlin
Humboldt-universität zu Berlin
Peron, Giada
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Prokhorov, Dmitry A.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Pühlhofer, Gerd
Germany, Tubingen
Eberhard Karls Universität Tübingen
Punch, Michael
France, Paris
Cnrs Centre National de la Recherche Scientifique
Sweden, Vaxjo
Linnaeus University, Växjö
Quirrenbach, Andreas
Germany, Heidelberg
Universität Heidelberg
Reichherzer, Patrick
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Reimer, Anita
Austria, Innsbruck
Universität Innsbruck
Reimer, Olaf
Austria, Innsbruck
Universität Innsbruck
Renaud, Matthieu
France, Montpellier
Université de Montpellier
Reville, Brian
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Rieger, Frank M.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Rowell, Gavin P.
Australia, Adelaide
The University of Adelaide
Rudak, Bronisław
Poland, Warszawa
Polish Academy of Sciences
Sahakian, Vardan H.
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
Schutte, Hester M.
South Africa, Potchefstroom
North-west University
Schwanke, Ullrich
Germany, Berlin
Humboldt-universität zu Berlin
Shapopi, J. N.S.
Namibia, Windhoek
University of Namibia
Stawarz, Łukasz
Poland, Krakow
Uniwersytet Jagielloński
Steenkamp, R.
Namibia, Windhoek
University of Namibia
Steppa, Constantin
Germany, Potsdam
Universität Potsdam
Sushch, Iurii
South Africa, Potchefstroom
North-west University
Takahashi, Tadayuki
Japan, Tokyo
The University of Tokyo
Terrier, Régis
France, Paris
Cnrs Centre National de la Recherche Scientifique
Tuffs, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Van Eldik, Christopher
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
van Soelen, Brian V.A.N.
South Africa, Bloemfontein
University of the Free State
Venter, Christo
South Africa, Potchefstroom
North-west University
Vink, Jacco S.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Wagner, Stefan J.
Germany, Heidelberg
Universität Heidelberg
White, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Wierzcholska, Alicja
Poland, Krakow
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Zacharias, Michael
South Africa, Potchefstroom
North-west University
France, Paris
Université Psl
Zdziarski, Andrzej A.
Poland, Warszawa
Polish Academy of Sciences
Zhu, Sylvia J.
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Blackwell, Rebecca
Australia, Adelaide
The University of Adelaide
Braiding, Catherine R.
Australia, Sydney
Unsw Sydney
Burton, Michael G.
United Kingdom, Armagh
Armagh Observatory
Filipovíc, Miroslav D.
Australia, Penrith
Western Sydney University
Tothill, Nicholas F.H.
Australia, Penrith
Western Sydney University
Wong, Graeme F.
Australia, Penrith
Western Sydney University
Statistics
Citations: 10
Authors: 140
Affiliations: 39
Identifiers
Doi:
10.1051/0004-6361/202244323
ISSN:
00046361
Research Areas
Environmental