| HAL : in2p3-00124916, version 1 |
| arXiv : astro-ph/0606311 |
| DOI : 10.1051/0004-6361:20065511 |
| Fiche détaillée | Récupérer au format |
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| Astronomy and Astrophysics 456 (2006) 245-251 |
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| Discovery of the two wings of the Kookaburra complex in VHE gamma -rays with H.E.S.S |
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| F. AharonianA. G. Akhperjanian |
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| HESS Collaboration(s) |
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| (2006) |
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| 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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| 1 : | Centre d'étude spatiale des rayonnements (CESR) |
| CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III | |
| 2 : | Laboratoire Univers et Théories (LUTH) |
| CNRS : UMR8102 – INSU – Observatoire de Paris – Université Paris VII - Paris Diderot | |
| 3 : | Laboratoire Leprince-Ringuet (LLR) |
| CNRS : UMR7638 – IN2P3 – Polytechnique - X | |
| 4 : | AstroParticule et Cosmologie (APC) |
| CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU | |
| 5 : | Laboratoire de Physique Théorique et Astroparticules (LPTA) |
| CNRS : UMR5207 – IN2P3 – Université Montpellier II - Sciences et techniques | |
| 6 : | Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA) |
| CEA : DSM/DAPNIA | |
| 7 : | Laboratoire d'Astrophysique de Grenoble (LAOG) |
| CNRS : UMR5571 – OSUG – INSU – Université Joseph Fourier - Grenoble I | |
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| APC - AHE |
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| Thème(s) | : | Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique |
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| ISM: general – gamma rays: observations – radiation mechanisms: non-thermal |
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| Lien vers le texte intégral : |
| in2p3-00124916, version 1 | |
| http://hal.in2p3.fr/in2p3-00124916 | |
| oai:hal.in2p3.fr:in2p3-00124916 | |
| Contributeur : Simone Lantz | |
| Soumis le : Mardi 12 Juin 2007, 15:50:17 | |
| Dernière modification le : Samedi 17 Mars 2012, 14:35:06 | |