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Astronomy and Astrophysics 456 (2006) 245-251
Discovery of the two wings of the Kookaburra complex in VHE gamma -rays with H.E.S.S
F. Aharonian, A. G. Akhperjanian, A. R. Bazer-Bachi1, M. Beilicke, W. Benbow, D. Berge, K. Bernlöhr, C. Boisson2, O. Bolz, V. Borrel1, I. Braun, F. Breitling, A. M. Brown, R. Bühler, I. Büsching, S. Carrigan, P. M. Chadwick, L.-M. Chounet3, R. Cornils, L. Costamante, B. Degrange3, H. J. Dickinson, A. Djannati-Ataï4, L. O'C. Drury, G. Dubus3, K. Egberts, D. Emmanoulopoulos, P. Espigat4, F. Feinstein5, E. Ferrero, G. Fontaine3, Seb. Funk, S. Funk, Y. A. Gallant5, B. Giebels3, J. F. Glicenstein6, P. Goret6, C. Hadjichristidis, D. Hauser, M. Hauser, G. Heinzelmann, G. Henri7, G. Hermann, J. A. Hinton, W. Hofmann, M. Holleran, D. Horns, A. Jacholkowska5, O. C. De Jager, B. Khélifi3, Nu. Komin, A. Konopelko, I. J. Latham, R. Le Gallou, A. Lemière4, M. Lemoine-Goumard3, T. Lohse, J. M. Martin, O. Martineau-Huynh, A. Marcowith1, C. Masterson, T. J. L. Mccomb, M. De Naurois, D. Nedbal, S. J. Nolan, A. Noutsos, K. J. Orford, J. L. Osborne, M. Ouchrif, M. Panter, G. Pelletier7, S. Pita4, G. Pühlhofer, M. Punch4, B. C. Raubenheimer, M. Raue, S. M. Rayner, A. Reimer, O. Reimer, J. Ripken, L. Rob, L. Rolland, G. Rowell, V. Sahakian, L. Saugé7, S. Schlenker, R. Schlickeiser, U. Schwanke, H. Sol2, D. Spangler, F. Spanier, R. Steenkamp, C. Stegmann, G. Superina3, J.-P. Tavernet, R. Terrier4, C.G. Théoret4, M. Tluczykont3, C. Van Eldik, G. Vasileiadis5, C. Venter, P. Vincent, H. J. Völk, S. J. Wagner, M. Ward
HESS Collaboration(s)

Aims. Search for Very High Energy gamma-ray emission in the Kookaburra complex through observations with the H.E.S.S. 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 (>13sigma) statistical significance: HESS J1420-607 and HESS J1418-609. They exhibit a flux above 1 TeV of (2.97+/-0.18stat +/-0.60sys)x10-12 and (2.17+/-0.17stat +/-0.43sys)x10-12 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 nebulae candidates, K3/PSR J1420-6048 and the Rabbit, lie on the edge of the H.E.S.S. 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 nebulae 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 H.E.S.S. sources. The most likely explanation for the Very High Energy gamma-rays discovered by H.E.S.S. is inverse Compton emission of accelerated electrons on the Cosmic Microwave Background near the two candidate pulsar wind nebulae, 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.
1 :  CESR - Centre d'étude spatiale des rayonnements
2 :  LUTH - Laboratoire Univers et Théories
3 :  LLR - Laboratoire Leprince-Ringuet
4 :  APC - UMR 7164 - AstroParticule et Cosmologie
5 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
6 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
7 :  LAOG - Laboratoire d'Astrophysique de Grenoble
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
ISM: general – gamma rays: observations – radiation mechanisms: non-thermal
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