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  Detection of extended VHE γ-ray emission from the vicinity of Westerlund 1

Ohm, S., Fernandes, M., de Ona Wilhelmi, E., de Naurois, M., Horns, D., Reimer, O., et al. (2011). Detection of extended VHE γ-ray emission from the vicinity of Westerlund 1. Proceedings of Science, Texas2010: 257, 1-6.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-33B0-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-33B1-4
Genre: Conference Paper

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 Creators:
Ohm, S.1, 2, 3, Author              
Fernandes, M.V.4, Author
de Ona Wilhelmi, Emma1, Author              
de Naurois, M.5, Author
Horns, D.4, Author
Reimer, O.6, Author
Rowell, G. P.7, Author
Marcowith, A.8, Author
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2School of Physics & Astronomy, University of Leeds, UK, ou_persistent22              
3Department of Physics & Astronomy, University of Leicester, UK, ou_persistent22              
4Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany, ou_persistent22              
5LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, 4 Place Jussieu, France, ou_persistent22              
6Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, Innsbruck, Austria, ou_persistent22              
7School of Chemistry & Physics, University of Adelaide, Adelaide, Australia, ou_persistent22              
8Laboratoire de Physique théorique et astroparticules, université Montpellier II, CNRS/IN2P3, Montpellier, France, ou_persistent22              

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 Abstract: Westerlund 1 (Wd1) is best known for being the most massive stellar cluster in the Galaxy, harbouring the richest population (≥ 24) of stars in the Wolf-Rayet phase. The dissipated power in the form of kinetic energy in stellar winds and expanding supernova (SN) shells has been estimated to reach L ≈ 3×10^39 erg s^−1. A fraction of the kinetic energy is available to accelerate particles to very-high energies, e.g. at the boundaries of wind-blown bubbles, in colliding wind zones in binary systems, or in the framework of collective wind or wind/SN ejecta scenarios. Owing to these particle acceleration scenarios, Wd 1 has become a promising target for VHE γ-ray observations. Here we present spectral and morphological results of H.E.S.S. observations of Wd 1 performed from 2004 to 2008 and discuss the origin of the detected, degree-scale VHE γ-ray emission in the context of different particle acceleration mechanisms.

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 Dates: 2011
 Publication Status: Published online
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Title: 25th Texas Symposium on Relativistic Astrophysics
Place of Event: Heidelberg
Start-/End Date: 2010-12-06 - 2010-12-10

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Title: Proceedings of Science
Source Genre: Journal
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Pages: - Volume / Issue: Texas2010 Sequence Number: 257 Start / End Page: 1 - 6 Identifier: ISSN: 1824-8039
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000018850_1