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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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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.
-
Bernloehr, K.
-
Birsin, E.
-
Biteau, J.
-
Bochow, A.
-
Boisson, C.
-
Bolmont, J.
-
Bordas, P.
-
Brucker, J.
-
Brun, F.
-
Brun, P.
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Bulik, T.
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Buesching, I.
-
Carrigan, S.
-
Casanova, S.
-
Cerruti, M.
-
Punch, Michael
-
Charbonnier, A.
-
Chaves, R. C. G.
-
Cheesebrough, A.
-
Chounet, L. -M
-
Clapson, A. C.
-
Coignet, G.
-
Cologna, G.
-
Conrad, Jan M.
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Dalton, M.
-
Daniel, M. K.
-
Davids, I. D.
-
Degrange, B.
-
Deil, C.
-
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.
-
Dubus, G.
-
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.
-
Gast, H.
-
Gerard, L.
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Gerbig, D.
-
Giebels, B.
-
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.
-
de Jager, O. C.
-
Jahn, C.
-
Jamrozy, M.
-
Jung, I.
-
Kastendieck, M. ...
-
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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