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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-Bachi 1 M. Beilicke W. Benbow D. Berge K. Bernlöhr C. Boisson 2 O. Bolz V. Borrel 1 I. Braun F. Breitling A. M. Brown R. Bühler I. Büsching S. Carrigan P. M. Chadwick L.-M. Chounet 3 R. Cornils L. Costamante B. Degrange 3 H. J. Dickinson A. Djannati-Ataï 4 L. O'C. Drury G. Dubus 3 K. Egberts D. Emmanoulopoulos P. Espigat 4 F. Feinstein 5 E. Ferrero G. Fontaine 3 Seb. Funk S. Funk Y.A. Gallant 5 B. Giebels 3 J. F. Glicenstein 6 P. Goret 6 C. Hadjichristidis D. Hauser M. Hauser G. Heinzelmann G. Henri 7 G. Hermann J. A. Hinton W. Hofmann M. Holleran D. Horns A. Jacholkowska 5 O. C. de Jager B. Khélifi 3 Nu. Komin A. Konopelko I. J. Latham R. Le Gallou A. Lemière 4 M. Lemoine-Goumard 3 T. Lohse J. M. Martin O. Martineau-Huynh A. Marcowith 1 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. Pelletier 7 S. Pita 4 G. Pühlhofer M. Punch 4 B. C. Raubenheimer M. Raue S. M. Rayner A. Reimer O. Reimer J. Ripken L. Rob L. Rolland G. Rowell V. Sahakian L. Saugé 7 S. Schlenker R. Schlickeiser U. Schwanke H. Sol 2 D. Spangler F. Spanier R. Steenkamp C. Stegmann G. Superina 3 J.-P. Tavernet R. Terrier 8 C.G. Théoret 4 M. Tluczykont 3 C. van Eldik G. Vasileiadis 5 C. Venter P. Vincent H. J. Völk S. J. Wagner M. Ward
Abstract : 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.
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F. Aharonian, A. G. Akhperjanian, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, et al.. Discovery of the two wings of the Kookaburra complex in VHE gamma -rays with H.E.S.S. Astronomy and Astrophysics - A&A, EDP Sciences, 2006, 456, pp.245-251. ⟨10.1051/0004-6361:20065511⟩. ⟨in2p3-00124916⟩

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