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Title: Discovery of the two "wings" of the Kookaburra complex in VHE γ-rays with HESS
Authors: Aharonian, F.
Benbow, W.
Berge, D.
Bernlöhr, K.
Bolz, O.
Braun, I.
Bühler, R.
Carrigan, S.
Costamante, L.
Egberts, K.
Funk, S.
Dubus, G.
Fontaine, G.
Giebels, B.
Khélifi, B.
Lemoine-Goumard, M.
Emmanoulopoulos, D.
Superina, G.
Tluczykont, M.
Djannati-Ataï, A.
Espigat, P.
Wagner, S. J.
Lemière, A.
Maurin, G.
Pita, S.
Punch, M.
Terrier, R.
Théoret, C. G.
Ferrero, E.
Drury, L. O.
Hauser, M.
Hinton, J. A.
Feinstein, F.
Pühlhofer, G.
Fiasson, A.
Gallant, Y. A.
Jacholkowska, A.
Santangelo, A.
Komin, N.
Vasileiadis, G.
Glicenstein, J. F.
Goret, P.
Tavernet, J. -. P.
Rolland, L.
Henri, G.
Pelletier, G.
Saugé, L.
Hoffmann, A.
Horns, D.
Schwarzburg, S.
Kendziorra, E.
Martineau-Huynh, O.
de Naurois M
Vincent, P.
Ouchrif, M.
Nedbal, D.
Rob, L.
Reimer, A.
Hauser, D.
Reimer, O.
Schlickeiser, R.
Schroder, R.
Shalchi, A.
Kosack, K.
Spanier, F.
Steenkamp, R.
Stegmann, C.
Costamante, L.
Masterson, C.
Ouchrif, M.
Hermann, G.
Tluczykont, M.
Hinton, J. A.
Hofmann, W.
Masterson, C.
Khélifi, B.
Panter, M.
Rowell, G.
van Eldik C
Völk, H. J.
Akhperjanian, A. G.
Sahakian, V.
Bazer-Bachi, A. R.
Borrel, V.
Schlenker, S.
Marcowith, A.
Beilicke, M.
Cornils, R.
Heinzelmann, G.
Raue, M.
Ripken, J.
Bernlöhr, K.
Funk, S.
Füßling, M.
Konopelko, A.
Schwanke, U.
Lohse, T.
Boisson, C.
Martin, J. M.
Sol, H.
Brown, A. M.
Chadwick, P. M.
Dickinson, H. J.
Hadjichristidis, C.
Latham, I. J.
de Jager OC
le Gallou R
McComb, T. J. L.
Nolan, S. J.
Noutsos, A.
Orford, K. J.
Osborne, J. L.
Rayner, S. M.
Spangler, D.
Ward, M.
Büsching, I.
Raubenheimer, B. C.
Holleran, M.
Venter, C.
Chounet, L. -. M.
Degrange, B.
First Published: Sep-2006
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2006, 456 (1), pp. 245-251
Abstract: Aims.Search for Very High Energy $\gamma$-ray emission in the Kookaburra complex through observations with the HESS array. Methods.Stereoscopic imaging of Cherenkov light emission of the $\gamma$-ray showers in the atmosphere is used for the reconstruction and selection of the events to search for $\gamma$-ray signals. Their spectrum is derived by a forward-folding maximum likelihood fit. Results.Two extended $\gamma$-ray sources with an angular (68%) radius of 3.3-3.4´ are discovered at high (>13$\sigma$) statistical significance: HESS J1420-607 and HESS J1418-609. They exhibit a flux above 1 TeV of ( $2.97 \pm 0.18_{\rm stat} \pm 0.60_{\rm sys}) \times 10^{-12}$ and ( $2.17 \pm 0.17_{\rm stat} \pm 0.43_{\rm sys}) \times 10^{-12}$ cm-2 s-1, respectively, and similar hard photon indices ~2.2. Multi-wavelength comparisons show spatial coincidence with the wings of the Kookaburra. Two pulsar wind nebulæ candidates, K3/PSR J1420-6048 and the Rabbit, lie on the edge of the HESS sources. Conclusions. The two new sources confirm the non-thermal nature of at least parts of the two radio wings which overlap with the $\gamma$-ray emission and establish their connection with the two X-ray pulsar wind nebulæ candidates. Given the large point spread function of EGRET, the unidentified source(s) 3EG J1420-6038/GeV J1417-6100 could possibly be related to either or both HESS sources. The most likely explanation for the Very High Energy $\gamma$-rays discovered by HESS is inverse Compton emission of accelerated electrons on the Cosmic Microwave Background near the two candidate pulsar wind nebulæ, K3/PSR J1420-6048 and the Rabbit. Two scenarios which could lead to the observed large (~10 pc) offset-nebula type morphologies are briefly discussed.
DOI Link: 10.1051/0004-6361:20065511
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2006 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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