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dc.contributor.authorAbramowski, A.
dc.contributor.authorBüsching, I.
dc.contributor.authorCasanova, S.
dc.contributor.authorDavids, I.D.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorHolleran, M.
dc.contributor.authorSushch, I.
dc.contributor.authorVenter, C.
dc.date.accessioned2012-09-04T13:01:11Z
dc.date.available2012-09-04T13:01:11Z
dc.date.issued2011
dc.identifier.citationAbramowski, A. et al. 2011. Revisiting the Westerlund 2 field with the HESS telescope array. Astronomy & astrophysics, 525(A46):1-8. [http://www.aanda.org]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/7228
dc.identifier.urihttp://dx.doi.org/10.1051/0004-6361/201015290
dc.description.abstractAims. Previous observations with the HESS telescope array revealed the existence of extended very-high-energy (VHE; E > 100 GeV) γ-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 γ-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 spectrum VHE γ-ray source, HESS J1026–582, was discovered with a statistical significance of 7σ. It is positionally coincident with the Fermi LAT pulsar PSRJ1028–5819. The positional coincidence and radio/γ-ray characteristics of the LAT pulsar favors a scenario where the TeV emission originates from a pulsar wind nebula. The nature of HESS J1023–575 is discussed in light of the deep HESS observations and recent multi-wavelength discoveries, including the Fermi LAT pulsar PSRJ1022–5746 and giant molecular clouds in the region. Despite the improved VHE dataset, a clear identification of the object responsible for the VHE emission from HESS J1023–575 is not yet possible, and contribution from the nearby high-energy pulsar and/or the open cluster remains a possibility.
dc.description.urihttp://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2011/01/aa15290-10/aa15290-10.html
dc.languageEnglish
dc.publisherEDP Sciences
dc.titleRevisiting the Westerlund 2 field with the HESS telescope arrayen_US
dc.typeJournal
dc.contributor.researchID10859748 - Holleran, Mathew
dc.contributor.researchID12006653 - Venter, Christo


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