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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

The H Collaboration (2006)

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

aap, 456:245-251.

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 (>13sigma) statistical significance: HESS J1420-607 and HESS J1418-609. They exhibit a flux above 1 TeV of (2.97 ± 0.18_stat ± 0.60_sys) × 10^-12 and (2.17 ± 0.17_stat ± 0.43_sys) × 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.

Provided by the SAO/NASA Astrophysics Data System