Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array
- Abramowski, A.
- Acero, Fabio
- Aharonian, F.
- Akhperjanian, A. G.
- Anton, G.
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- De Almeida, U. Barres
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- Domainko, W.
- Drury, L. O'C.
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- Dyrda, M.
- Egberts, K.
- Eger, P.
- Espigat, P.
- Fallon, L.
- Farnier, C.
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- Fiasson, A.
- Förster, A.
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- Hauser, M.
- Heinz, S.
- Heinzelmann, G.
- Henri, G.
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- Hoffmann, A.
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- Kneiske, T.
- Komin, Nu.
- Kosack, K.
- Kossakowski, R.
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- Lennarz, D.
- Lohse, T.
- Lu, C. -C.
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- Viana, A.
- Vincent, P.
- Vivier, M.
- Völk, H. J.
- Volpe, F.
- Vorobiov, S.
- Wagner, S. J.
- Ward, M.
- Zdziarski, A. A.
- Zech, A.
- Zechlin, H. -S.
- Fukui, Y.
- Furukawa, N.
- Ohama, A.
- Sano, H.
- Dawson, J.
- Kawamura, A.
DOIAbstract
Accepted for publication on A&AAims. Previous observations with the H.E.S.S. telescope array revealed the existence of extended very-high-energy (VHE; E>100 GeV) {\gamma}-ray emission, HESS J1023-575, coincident with the young stellar cluster Westerlund 2. At the time of discovery, the origin of the observed emission was not unambiguously identified, and follow-up observations have been performed to further investigate the nature of this {\gamma}-ray source. Methods. The Carina region towards the open cluster Westerlund 2 has been re-observed, increasing the total exposure to 45.9 h. The combined dataset includes 33 h of new data and now permits a search for energy-dependent morphology and detailed spectroscopy. Results. A new, hard spectru...
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