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Discovery of extend...
Discovery of extended VHE gamma-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
- Article/chapterEnglish2012
Publisher, publication year, extent ...
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2012-01-17
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EDP Sciences,2012
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:lnu-30233
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https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30233URI
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https://doi.org/10.1051/0004-6361/201117928DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162448URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Aims. Results obtained in very-high-energy (VHE; E >= 100 GeV) gamma-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in the vicinity of the young massive stellar cluster Westerlund 1 (Wd 1). Methods. Imaging of Cherenkov light from gamma-ray induced particle cascades in the Earth's atmosphere is used to search for VHE gamma rays from the region around Wd 1. Possible catalogued counterparts are searched for and discussed in terms of morphology and energetics of the H.E.S.S. source. Results. The detection of the degree-scale extended VHE gamma-ray source HESS J1646-458 is reported based on 45 h of H.E.S.S. observations performed between 2004 and 2008. The VHE gamma-ray source is centred on the nominal position of Wd 1 and detected with a total statistical significance of similar to 20 sigma. The emission region clearly extends beyond the H.E.S.S. point-spread function (PSF). The differential energy spectrum follows a power law in energy with an index of Gamma = 2.19 +/- 0.08(stat) +/- 0.20(sys) and a flux normalisation at 1 TeV of Phi(0) = (9.0 +/- 1.4(stat) +/- 1.8(sys)) x 10(-12) TeV-1 cm(-2) s(-1). The integral flux above 0.2 TeV amounts to (5.2 +/- 0.9) x 10(-11) cm(-2) s(-1). Conclusions. Four objects coincident with HESS J1646-458 are discussed in the search of a counterpart, namely the magnetar CXOU J164710.2-455216, the X-ray binary 4U 1642-45, the pulsar PSR J1648-4611 and the massive stellar cluster Wd 1. In a single-source scenario, Wd 1 is favoured as site of VHE particle acceleration. Here, a hadronic parent population would be accelerated within the stellar cluster. Beside this, there is evidence for a multi-source origin, where a scenario involving PSR J1648-4611 could be viable to explain parts of the VHE gamma-ray emission of HESS J1646-458.
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Acero, F.
(author)
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Aharonian, F.
(author)
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Akhperjanian, A. G.
(author)
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Anton, G.
(author)
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Balzer, A.
(author)
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Barnacka, A.
(author)
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de Almeida, U. Barres
(author)
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Becherini, Yvonne
(author)
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Becker, J.
(author)
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Behera, B.
(author)
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Bernloehr, K.
(author)
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Birsin, E.
(author)
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Biteau, J.
(author)
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Bochow, A.
(author)
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Boisson, C.
(author)
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Bolmont, J.
(author)
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Bordas, P.
(author)
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Brucker, J.
(author)
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Brun, F.
(author)
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Brun, P.
(author)
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Bulik, T.
(author)
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Buesching, I.
(author)
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Carrigan, S.
(author)
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Casanova, S.
(author)
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Cerruti, M.
(author)
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Punch, MichaelUniv Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa
(author)
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Charbonnier, A.
(author)
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Chaves, R. C. G.
(author)
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Cheesebrough, A.
(author)
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Chounet, L. -M
(author)
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Clapson, A. C.
(author)
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Coignet, G.
(author)
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Cologna, G.
(author)
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Conrad, Jan M.Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)conrad
(author)
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Dalton, M.
(author)
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Daniel, M. K.
(author)
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Davids, I. D.
(author)
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Degrange, B.
(author)
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Deil, C.
(author)
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Dickinson, Hugh J.Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)hdick
(author)
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Djannati-Atai, A.
(author)
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Domainko, W.
(author)
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Drury, L. O 'C.
(author)
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Dubois, F.
(author)
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Dubus, G.
(author)
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Dutson, K.
(author)
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Dyks, J.
(author)
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Dyrda, M.
(author)
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Egberts, K.
(author)
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Eger, P.
(author)
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Espigat, P.
(author)
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Fallon, L.
(author)
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Farnier, C.
(author)
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Fegan, S.
(author)
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Feinstein, F.
(author)
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Fernandes, M. V.
(author)
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Fiasson, A.
(author)
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Fontaine, G.
(author)
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Foerster, A.
(author)
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Fuessling, M.
(author)
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Gallant, Y. A.
(author)
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Gast, H.
(author)
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Gerard, L.
(author)
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Gerbig, D.
(author)
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Giebels, B.
(author)
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Glicenstein, J. F.
(author)
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Glueck, B.
(author)
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Goret, P.
(author)
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Goering, D.
(author)
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Haeffner, S.
(author)
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Hague, J. D.
(author)
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Hampf, D.
(author)
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Hauser, M.
(author)
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Heinz, S.
(author)
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Heinzelmann, G.
(author)
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Henri, G.
(author)
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Hermann, G.
(author)
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Hinton, J. A.
(author)
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Hoffmann, A.
(author)
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Hofmann, W.
(author)
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Hofverberg, P.
(author)
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Holler, M.
(author)
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Horns, D.
(author)
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Jacholkowska, A.
(author)
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de Jager, O. C.
(author)
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Jahn, C.
(author)
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Jamrozy, M.
(author)
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Jung, I.
(author)
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Kastendieck, M. A.
(author)
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Katarzynski, K.
(author)
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Katz, U.
(author)
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Kaufmann, S.
(author)
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Keogh, D.
(author)
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Khangulyan, D.
(author)
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Khelifi, B.
(author)
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Klochkov, D.
(author)
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Kluzniak, W.
(author)
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Kneiske, T.
(author)
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Komin, Nu
(author)
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Kosack, K.
(author)
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Kossakowski, R.
(author)
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Laffon, H.
(author)
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Lamanna, G.
(author)
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Lennarz, D.
(author)
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Lohse, T.
(author)
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Lopatin, A.
(author)
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Lu, C. -C
(author)
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Marandon, V.
(author)
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Marcowith, A.
(author)
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Masbou, J.
(author)
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Maurin, D.
(author)
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Maxted, N.
(author)
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Mayer, M.
(author)
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McComb, T. J. L.
(author)
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Medina, M. C.
(author)
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Mehault, J.
(author)
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Moderski, R.
(author)
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Moulin, E.
(author)
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Naumann, C. L.
(author)
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Naumann-Godo, M.
(author)
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de Naurois, M.
(author)
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Nedbal, D.
(author)
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Nekrassov, D.
(author)
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Nguyen, N.
(author)
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Nicholas, B.
(author)
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Niemiec, J.
(author)
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Nolan, S. J.
(author)
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Ohm, S.
(author)
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Wilhelmi, E. de Ona
(author)
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Opitz, B.
(author)
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Ostrowski, M.
(author)
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Oya, I.
(author)
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Panter, M.
(author)
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Arribas, M. Paz
(author)
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Pedaletti, G.
(author)
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Pelletier, G.
(author)
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Petrucci, P. -O
(author)
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Pita, S.
(author)
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Puehlhofer, G.
(author)
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Punch, MichaelUniv Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa
(author)
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Quirrenbach, A.
(author)
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Raue, M.
(author)
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Rayner, S. M.
(author)
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Reimer, A.
(author)
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Reimer, O.
(author)
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Renaud, M.
(author)
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Reyes, R. de los
(author)
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Rieger, F.
(author)
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Ripken, JoachimStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ripken
(author)
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Rob, L.
(author)
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Rosier-Lees, S.
(author)
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Rowell, G.
(author)
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Rudak, B.
(author)
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Rulten, C. B.
(author)
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Ruppel, J.
(author)
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Sahakian, V.
(author)
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Sanchez, D.
(author)
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Santangelo, A.
(author)
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Schlickeiser, R.
(author)
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Schoeck, F. M.
(author)
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Schulz, A.
(author)
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Schwanke, U.
(author)
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Schwarzburg, S.
(author)
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Schwemmer, S.
(author)
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Sheidaei, F.
(author)
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Sikora, M.
(author)
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Skilton, J. L.
(author)
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Sol, H.
(author)
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Spengler, G.
(author)
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Stawarz, L.
(author)
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Steenkamp, R.
(author)
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Stegmann, C.
(author)
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Stinzing, F.
(author)
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Stycz, K.
(author)
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Sushch, I.
(author)
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Szostek, A.
(author)
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Tavernet, J. -P
(author)
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Terrier, R.
(author)
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Tluczykont, M.
(author)
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Valerius, K.
(author)
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van Eldik, C.
(author)
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Vasileiadis, G.
(author)
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Venter, C.
(author)
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Vialle, J. P.
(author)
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Viana, A.
(author)
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Vincent, P.
(author)
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Voelk, H. J.
(author)
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Volpe, F.
(author)
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Vorobiov, S.
(author)
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Vorster, M.
(author)
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Wagner, S. J.
(author)
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Ward, M.
(author)
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White, R.
(author)
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Wierzcholska, A.
(author)
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Zacharias, M.
(author)
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Zajczyk, A.
(author)
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Zdziarski, A. A.
(author)
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Zech, A.
(author)
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Zechlin, H. -S
(author)
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Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, FranceFysikum
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In:Astronomy and Astrophysics: EDP Sciences537, s. A114-0004-63611432-0746
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Abramowski, A.
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Acero, F.
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Aharonian, F.
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Akhperjanian, A. ...
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Anton, G.
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Balzer, A.
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Barnacka, A.
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de Almeida, U. B ...
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Becherini, Yvonn ...
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Becker, J.
-
Behera, B.
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Bernloehr, K.
-
Birsin, E.
-
Biteau, J.
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Bochow, A.
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Boisson, C.
-
Bolmont, J.
-
Bordas, P.
-
Brucker, J.
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Brun, F.
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Brun, P.
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Bulik, T.
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Buesching, I.
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Carrigan, S.
-
Casanova, S.
-
Cerruti, M.
-
Punch, Michael
-
Charbonnier, A.
-
Chaves, R. C. G.
-
Cheesebrough, A.
-
Chounet, L. -M
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Clapson, A. C.
-
Coignet, G.
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Cologna, G.
-
Conrad, Jan M.
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Dalton, M.
-
Daniel, M. K.
-
Davids, I. D.
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Degrange, B.
-
Deil, C.
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Dickinson, Hugh ...
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Djannati-Atai, A ...
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Domainko, W.
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Drury, L. O 'C.
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Dubois, F.
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Dubus, G.
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Dutson, K.
-
Dyks, J.
-
Dyrda, M.
-
Egberts, K.
-
Eger, P.
-
Espigat, P.
-
Fallon, L.
-
Farnier, C.
-
Fegan, S.
-
Feinstein, F.
-
Fernandes, M. V.
-
Fiasson, A.
-
Fontaine, G.
-
Foerster, A.
-
Fuessling, M.
-
Gallant, Y. A.
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Gast, H.
-
Gerard, L.
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Gerbig, D.
-
Giebels, B.
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Glicenstein, J. ...
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Glueck, B.
-
Goret, P.
-
Goering, D.
-
Haeffner, S.
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Hague, J. D.
-
Hampf, D.
-
Hauser, M.
-
Heinz, S.
-
Heinzelmann, G.
-
Henri, G.
-
Hermann, G.
-
Hinton, J. A.
-
Hoffmann, A.
-
Hofmann, W.
-
Hofverberg, P.
-
Holler, M.
-
Horns, D.
-
Jacholkowska, A.
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de Jager, O. C.
-
Jahn, C.
-
Jamrozy, M.
-
Jung, I.
-
Kastendieck, M. ...
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Katarzynski, K.
-
Katz, U.
-
Kaufmann, S.
-
Keogh, D.
-
Khangulyan, D.
-
Khelifi, B.
-
Klochkov, D.
-
Kluzniak, W.
-
Kneiske, T.
-
Komin, Nu
-
Kosack, K.
-
Kossakowski, R.
-
Laffon, H.
-
Lamanna, G.
-
Lennarz, D.
-
Lohse, T.
-
Lopatin, A.
-
Lu, C. -C
-
Marandon, V.
-
Marcowith, A.
-
Masbou, J.
-
Maurin, D.
-
Maxted, N.
-
Mayer, M.
-
McComb, T. J. L.
-
Medina, M. C.
-
Mehault, J.
-
Moderski, R.
-
Moulin, E.
-
Naumann, C. L.
-
Naumann-Godo, M.
-
de Naurois, M.
-
Nedbal, D.
-
Nekrassov, D.
-
Nguyen, N.
-
Nicholas, B.
-
Niemiec, J.
-
Nolan, S. J.
-
Ohm, S.
-
Wilhelmi, E. de ...
-
Opitz, B.
-
Ostrowski, M.
-
Oya, I.
-
Panter, M.
-
Arribas, M. Paz
-
Pedaletti, G.
-
Pelletier, G.
-
Petrucci, P. -O
-
Pita, S.
-
Puehlhofer, G.
-
Quirrenbach, A.
-
Raue, M.
-
Rayner, S. M.
-
Reimer, A.
-
Reimer, O.
-
Renaud, M.
-
Reyes, R. de los
-
Rieger, F.
-
Ripken, Joachim
-
Rob, L.
-
Rosier-Lees, S.
-
Rowell, G.
-
Rudak, B.
-
Rulten, C. B.
-
Ruppel, J.
-
Sahakian, V.
-
Sanchez, D.
-
Santangelo, A.
-
Schlickeiser, R.
-
Schoeck, F. M.
-
Schulz, A.
-
Schwanke, U.
-
Schwarzburg, S.
-
Schwemmer, S.
-
Sheidaei, F.
-
Sikora, M.
-
Skilton, J. L.
-
Sol, H.
-
Spengler, G.
-
Stawarz, L.
-
Steenkamp, R.
-
Stegmann, C.
-
Stinzing, F.
-
Stycz, K.
-
Sushch, I.
-
Szostek, A.
-
Tavernet, J. -P
-
Terrier, R.
-
Tluczykont, M.
-
Valerius, K.
-
van Eldik, C.
-
Vasileiadis, G.
-
Venter, C.
-
Vialle, J. P.
-
Viana, A.
-
Vincent, P.
-
Voelk, H. J.
-
Volpe, F.
-
Vorobiov, S.
-
Vorster, M.
-
Wagner, S. J.
-
Ward, M.
-
White, R.
-
Wierzcholska, A.
-
Zacharias, M.
-
Zajczyk, A.
-
Zdziarski, A. A.
-
Zech, A.
-
Zechlin, H. -S
-
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