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A deep spectromorph...
A deep spectromorphological study of the ϒ-ray emission surrounding the young massive stellar cluster Westerlund 1
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- Aharonian, F. (author)
- Dublin Inst Adv Studies, Ireland;Max Planck Inst Kernphys, Germany
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- Ashkar, H. (author)
- Ecole Polytech, France
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- Backes, M. (author)
- Univ Namibia, Namibia;North West Univ, South Africa
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show more...
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- Martins, V. Barbosa (author)
- DESY, Germany
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- Becherini, Yvonne (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE),Univ Paris, France
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- Berge, D. (author)
- DESY, Germany;Humboldt Univ, Germany
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- Bi, B. (author)
- Univ Tubingen, Germany
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- Bottcher, M. (author)
- North West Univ, South Africa
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- de Lavergne, M. de Bony (author)
- Univ Savoie Mt Blanc, France
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- Bradascio, F. (author)
- Univ Paris Saclay, France
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- Brose, R. (author)
- Dublin Inst Adv Studies, Ireland
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- Brun, F. (author)
- Univ Paris Saclay, France
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- Bulik, T. (author)
- Univ Warsaw, Poland
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- Burger-Scheidlin, C. (author)
- Dublin Inst Adv Studies, Ireland
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- Cangemi, F. (author)
- Sorbonne Univ, France
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- Caroff, S. (author)
- Sorbonne Univ, France
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- Casanova, S. (author)
- Inst Fizyki Jdrowej PAN, Poland
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- Cerruti, M. (author)
- Univ Paris, France
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- Chand, T. (author)
- North West Univ, South Africa
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- Chandra, S. (author)
- North West Univ, South Africa
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- Chen, A. (author)
- Univ Witwatersrand, South Africa
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- Chibueze, O. (author)
- North West Univ, South Africa
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- Cristofari, P. (author)
- Univ Paris, France
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- Mbarubucyeye, J. Damascene (author)
- DESY, Germany
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- Djannati-Atai, A. (author)
- Univ Paris, France
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- Ernenwein, J-P (author)
- Aix Marseille Univ, France
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- Feijen, K. (author)
- Univ Adelaide, Australia
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- de Clairfontaine, G. Fichet (author)
- Univ Paris, France
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- Fontaine, G. (author)
- Ecole Polytech, France
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- Funk, S. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Gabici, S. (author)
- Univ Paris, France
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- Gallant, Y. A. (author)
- Univ Montpellier, France
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- Ghafourizadeh, S. (author)
- Heidelberg Univ, Germany
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- Giavitto, G. (author)
- DESY, Germany
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- Giunti, L. (author)
- Univ Paris, France;Univ Paris Saclay, France
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- Glawion, D. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Glicenstein, J. F. (author)
- Univ Paris Saclay, France
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- Goswami, P. (author)
- North West Univ, South Africa
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- Grondin, M-H (author)
- Univ Bordeaux, France
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- Haerer, L. K. (author)
- Max Planck Inst Kernphys, Germany
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- Haupt, M. (author)
- DESY, Germany
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- Hinton, J. A. (author)
- Max Planck Inst Kernphys, Germany
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- Horbe, M. (author)
- Univ Oxford, UK
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- Hofmann, W. (author)
- Max Planck Inst Kernphys, Germany
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- Holch, T. L. (author)
- DESY, Germany
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- Holler, M. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Horns, D. (author)
- Univ Hamburg, Germany
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- Jamrozy, M. (author)
- Uniwersytet Jagiellonski, Poland
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- Joshi, V (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Jung-Richardt, I (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Kasai, E. (author)
- Univ Namibia, Namibia
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- Katarzynski, K. (author)
- Nicolaus Copernicus Univ, Poland
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- Katz, U. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Khelifi, B. (author)
- Univ Paris, France
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- Komin, Nu (author)
- Univ Witwatersrand, South Africa
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- Kosack, K. (author)
- Univ Paris Saclay, France
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- Kostunin, D. (author)
- DESY, Germany
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- Kukec Mezek, Gasper (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE)
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- Lang, R. G. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Le Stum, S. (author)
- Aix Marseille Univ, France
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- Lemiere, A. (author)
- Univ Paris, France
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- Lemoine-Goumard, M. (author)
- Univ Bordeaux, France
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- Lenain, J-P (author)
- Sorbonne Univ, France
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- Leuschner, F. (author)
- Univ Tubingen, Germany
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- Lohse, T. (author)
- Humboldt Univ, Germany
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- Luashvili, A. (author)
- Univ Paris, France
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- Lypova, I (author)
- Heidelberg Univ, Germany
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- Mackey, J. (author)
- Dublin Inst Adv Studies, Ireland
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- Majumdar, J. (author)
- DESY, Germany
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- Malyshev, D. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Marandon, V (author)
- Max Planck Inst Kernphys, Germany
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- Marchegiani, P. (author)
- Univ Witwatersrand, South Africa
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- Marcowith, A. (author)
- Univ Montpellier, France
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- Marti-Devesa, G. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Marx, R. (author)
- Heidelberg Univ, Germany
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- Maurin, G. (author)
- Univ Savoie Mt Blanc, France
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- Meyer, M. (author)
- Univ Hamburg, Germany
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- Mitchell, A. (author)
- Max Planck Inst Kernphys, Germany;Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Moderski, R. (author)
- Polish Acad Sci, Poland
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- Mohrmann, L. (author)
- Max Planck Inst Kernphys, Germany
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- Montanari, A. (author)
- Univ Paris Saclay, France
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- Moulin, E. (author)
- Univ Paris Saclay, France
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- Muller, J. (author)
- Ecole Polytech, France
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- Murach, T. (author)
- DESY, Germany
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- Nakashima, K. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- de Naurois, M. (author)
- Ecole Polytech, France
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- Nayerhoda, A. (author)
- Inst Fizyki Jdrowej PAN, Poland
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- Niemiec, J. (author)
- Inst Fizyki Jdrowej PAN, Poland
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- Ohm, S. (author)
- DESY, Germany
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- Olivera-Nieto, L. (author)
- Max Planck Inst Kernphys, Germany
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- Wilhelmi, E. de Ona (author)
- DESY, Germany
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- Ostrowski, M. (author)
- Uniwersytet Jagiellonski, Poland
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- Panny, S. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Panter, M. (author)
- Max Planck Inst Kernphys, Germany
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- Parsons, R. D. (author)
- Humboldt Univ, Germany
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- Peron, G. (author)
- Max Planck Inst Kernphys, Germany
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- Prokhorov, D. A. (author)
- Univ Amsterdam, Netherlands
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- Puehlhofer, G. (author)
- Univ Tubingen, Germany
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- Punch, Michael (author)
- Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE),Univ Paris, France
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- Quirrenbach, A. (author)
- Heidelberg Univ, Germany
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- Rauth, R. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Reichherzer, P. (author)
- Univ Paris Saclay, France
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- Reimer, A. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Reimer, O. (author)
- Leopold Franzens Univ Innsbruck, Austria
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- Renaud, M. (author)
- Univ Montpellier, France
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- Reville, B. (author)
- Max Planck Inst Kernphys, Germany
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- Rieger, F. (author)
- Max Planck Inst Kernphys, Germany
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- Rowell, G. (author)
- Univ Adelaide, Australia
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- Rudak, B. (author)
- Polish Acad Sci, Poland
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- Ruiz-Velasco, E. (author)
- Max Planck Inst Kernphys, Germany
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- Sahakian, V (author)
- Yerevan Phys Inst, Armenia
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- Salzmann, H. (author)
- Univ Tubingen, Germany
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- Sanchez, D. A. (author)
- Univ Savoie Mt Blanc, France
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- Santangelo, A. (author)
- Univ Tubingen, Germany
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- Sasaki, M. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Schussler, F. (author)
- Univ Paris Saclay, France
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- Schutte, H. M. (author)
- North West Univ, South Africa
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- Schwanke, U. (author)
- Humboldt Univ, Germany
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- Shapopi, J. N. S. (author)
- Univ Namibia, Namibia
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- Specovius, A. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Steenkamp, R. (author)
- Univ Namibia, Namibia
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- Steinmassl, S. (author)
- Max Planck Inst Kernphys, Germany
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- Steppa, C. (author)
- Univ Potsdam, Germany
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- Sushch, I (author)
- North West Univ, South Africa
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- Suzuki, H. (author)
- Konan Univ, Japan
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- Takahashi, T. (author)
- Univ Tokyo, Japan
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- Tanaka, T. (author)
- Konan Univ, Japan
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- Terrier, R. (author)
- Univ Paris, France
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- Thorpe-Morgan, C. (author)
- Univ Tubingen, Germany
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- Tsirou, M. (author)
- Max Planck Inst Kernphys, Germany
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- Tsuji, N. (author)
- RIKEN, Japan
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- Tuffs, R. (author)
- Max Planck Inst Kernphys, Germany
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- Unbehaun, T. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- van Eldik, C. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- van Soelen, B. (author)
- Univ Free State, South Africa
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- Vecchi, M. (author)
- Univ Amsterdam, Netherlands
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- Veh, J. (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Venter, C. (author)
- North West Univ, South Africa
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- Vink, J. (author)
- Univ Amsterdam, Netherlands
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- Wagner, S. J. (author)
- Heidelberg Univ, Germany
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- White, R. (author)
- Max Planck Inst Kernphys, Germany
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- Wierzcholska, A. (author)
- Inst Fizyki Jdrowej PAN, Poland
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- Wong, Y. Wun (author)
- Friedrich Alexander Univ Erlangen Nurnberg, Germany
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- Zacharias, M. (author)
- North West Univ, South Africa;Univ Paris, France
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- Zargaryan, D. (author)
- Dublin Inst Adv Studies, Ireland
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- Zdziarski, A. A. (author)
- Polish Acad Sci, Poland
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- Zhu, S. J. (author)
- DESY, Germany
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- Zouari, S. (author)
- Univ Paris, France
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- Zywucka, N. (author)
- North West Univ, South Africa
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- Blackwell, R. (author)
- Univ Adelaide, Australia
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- Braiding, C. (author)
- Univ New South Wales, Australia
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- Burton, M. (author)
- Armagh Observ & Planetarium, UK
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- Cubuk, K. (author)
- Armagh Observ & Planetarium, UK
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- Filipovic, M. (author)
- Western Sydney Univ, Australia
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- Tothill, N. (author)
- Western Sydney Univ, Australia
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- Wong, G. (author)
- Western Sydney Univ, Australia
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(creator_code:org_t)
- 2022-10-17
- 2022
- English.
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In: Astronomy and Astrophysics. - : EPD Sciences. - 0004-6361 .- 1432-0746. ; 666
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https://lnu.diva-por... (primary) (Raw object)
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Abstract
Subject headings
Close
- 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 gamma-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 gamma-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 gamma-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 (similar to 2 degrees diameter) gamma-ray emission with a complex morphology, exhibiting a shell-like structure and showing no significant variation with gamma-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 gamma-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 gamma-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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- acceleration of particles
- radiation mechanisms
- non-thermal
- shock waves
- stars
- massive
- gamma rays
- general
- galaxies
- star clusters
- individual
- Westerlund 1
- Astroparticle Physics
- Astropartikelfysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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Aharonian, F.
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Ashkar, H.
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Backes, M.
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Martins, V. Barb ...
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Becherini, Yvonn ...
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Berge, D.
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Bi, B.
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Bottcher, M.
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de Lavergne, M. ...
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Bradascio, F.
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Brose, R.
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Brun, F.
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Bulik, T.
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Burger-Scheidlin ...
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Cangemi, F.
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Caroff, S.
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Casanova, S.
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Cerruti, M.
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Chand, T.
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Chandra, S.
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Chen, A.
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Chibueze, O.
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Cristofari, P.
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Mbarubucyeye, J. ...
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Djannati-Atai, A ...
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Ernenwein, J-P
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Feijen, K.
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de Clairfontaine ...
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Fontaine, G.
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Funk, S.
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Gabici, S.
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Gallant, Y. A.
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Ghafourizadeh, S ...
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Giavitto, G.
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Giunti, L.
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Glawion, D.
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Glicenstein, J. ...
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Goswami, P.
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Grondin, M-H
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Haerer, L. K.
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Haupt, M.
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Hinton, J. A.
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Horbe, M.
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Hofmann, W.
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Holch, T. L.
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Holler, M.
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Horns, D.
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Jamrozy, M.
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Joshi, V
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Jung-Richardt, I
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Kasai, E.
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Katarzynski, K.
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Katz, U.
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Khelifi, B.
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Komin, Nu
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Kosack, K.
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Kostunin, D.
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Kukec Mezek, Gas ...
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Lang, R. G.
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Le Stum, S.
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Lemiere, A.
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Lemoine-Goumard, ...
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Lenain, J-P
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Leuschner, F.
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Lohse, T.
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Luashvili, A.
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Lypova, I
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Mackey, J.
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Majumdar, J.
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Malyshev, D.
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Marandon, V
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Marchegiani, P.
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Marcowith, A.
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Marti-Devesa, G.
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Marx, R.
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Maurin, G.
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Meyer, M.
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Mitchell, A.
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Moderski, R.
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Mohrmann, L.
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Montanari, A.
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Moulin, E.
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Muller, J.
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Murach, T.
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Nakashima, K.
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de Naurois, M.
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Nayerhoda, A.
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Niemiec, J.
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Ohm, S.
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Olivera-Nieto, L ...
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Wilhelmi, E. de ...
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Ostrowski, M.
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Panny, S.
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Panter, M.
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Parsons, R. D.
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Peron, G.
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Prokhorov, D. A.
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Puehlhofer, G.
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Punch, Michael
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Quirrenbach, A.
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Rauth, R.
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Reichherzer, P.
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Reimer, A.
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Reimer, O.
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Renaud, M.
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Reville, B.
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Rieger, F.
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Rowell, G.
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Rudak, B.
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Ruiz-Velasco, E.
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Sahakian, V
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Salzmann, H.
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Sanchez, D. A.
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Santangelo, A.
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Sasaki, M.
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Schussler, F.
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Schutte, H. M.
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Schwanke, U.
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Shapopi, J. N. S ...
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Specovius, A.
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Steenkamp, R.
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Steinmassl, S.
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Steppa, C.
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Sushch, I
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Suzuki, H.
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Takahashi, T.
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Tanaka, T.
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Terrier, R.
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Thorpe-Morgan, C ...
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Tsirou, M.
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Tsuji, N.
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Tuffs, R.
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Unbehaun, T.
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van Eldik, C.
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van Soelen, B.
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Vecchi, M.
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Veh, J.
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Venter, C.
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Vink, J.
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Wagner, S. J.
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White, R.
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Wierzcholska, A.
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Wong, Y. Wun
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Zacharias, M.
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Zargaryan, D.
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Zdziarski, A. A.
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Zhu, S. J.
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Zouari, S.
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Zywucka, N.
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Blackwell, R.
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Braiding, C.
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Burton, M.
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Cubuk, K.
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Filipovic, M.
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Tothill, N.
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Wong, G.
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