Discovery of the two wings of the Kookaburra complex in VHE γ-rays with HESS

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作者
Aharonian, F. [1 ]
Akhperjanian, A.G. [2 ]
Bazer-Bachi, A.R. [3 ]
Beilicke, M. [4 ]
Benbow, W. [1 ]
Berge, D. [1 ]
Bernlöhr, K. [1 ,5 ]
Boisson, C. [6 ]
Bolz, O. [1 ]
Borrel, V. [3 ]
Braun, I. [1 ]
Brown, A.M. [7 ]
Bühler, R. [1 ]
Büsching, I. [8 ]
Carrigan, S. [1 ]
Chadwick, P.M. [7 ]
Chounet, L.-M. [9 ]
Cornils, R. [4 ]
Costamante, L. [1 ,20 ]
Degrange, B. [9 ]
Dickinson, H.J. [7 ]
Djannati-Ataï, A. [10 ]
O'C Drury, L. [11 ]
Dubus, G. [9 ]
Egberts, K. [1 ]
Emmanoulopoulos, D. [12 ]
Espigat, P. [10 ]
Feinstein, F. [13 ]
Ferrero, E. [12 ]
Fiasson, A. [13 ]
Fontaine, G. [9 ]
Funk, S. [5 ]
Funk, S. [1 ]
Füßling, M. [5 ]
Gallant, Y.A. [13 ]
Giebels, B. [9 ]
Glicenstein, J.F. [14 ]
Goret, P. [14 ]
Hadjichristidis, C. [7 ]
Hauser, D. [1 ]
Hauser, M. [12 ]
Heinzelmann, G. [4 ]
Henri, G. [15 ]
Hermann, G. [1 ]
Hinton, J.A. [1 ,12 ]
Hoffmann, A. [16 ]
Hofmann, W. [1 ]
Holleran, M. [8 ]
Horns, D. [16 ]
Jacholkowska, A. [13 ]
机构
[1] Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany
[2] Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
[3] Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, 31029 Toulouse Cedex 4, France
[4] Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
[5] Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
[6] LUTH, UMR 8102 du CNRS, Section de Meudon, 92195 Meudon Cedex, France
[7] University of Durham, Department of Physics, South Road, Durham DH1 3LE, United Kingdom
[8] Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
[9] Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, 91128 Palaiseau, France
[10] APC, UMR 7164 (CNRS, Université Paris VII, CEA, Observatoire de Paris), 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
[11] Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
[12] Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany
[13] Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
[14] DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
[15] Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
[16] Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
[17] Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI and VII, 4 place Jussieu, 75252 Paris Cedex 5, France
[18] Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
[19] Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
[20] European Associated Laboratory for Gamma-Ray Astronomy
来源
Astronomy and Astrophysics | 2006年 / 456卷 / 01期
关键词
Aims. Search for Very High Energy γ-ray emission in the Kookaburra complex through observations with the HESS array. Methods. Stereoscopic imaging of Cherenkov light emission of the γ-ray showers in the atmosphere is used for the reconstruction and selection of the events to search for γ-ray signals. Their spectrum is derived by a forward-folding maximum likelihood fit. Results. Two extended γ-ray sources with an angular (68%) radius of 3.3-3.4′ are discovered at high (>13σ) statistical significance: HESS J1420-607 and HESS J1418-609. They exhibit a flux above 1 TeV of (2.97 ±0.188stat ±0.60sys) × 1012 and (2.17 ±0.17stat ±0.43sys) × 1012 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 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 γ-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 HESS sources. The most likely explanation for the Very High Energy γ-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. © ESO 2006;
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