TeV gamma-rays from photo-disintegration/de-excitation of nuclei in Westerlund 2

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dc.creatorAnchordoqui, Luis A.
dc.creatorBeacom, John F.
dc.creatorButt, Yousaf M.
dc.creatorGoldberg, Haim
dc.creatorPalomares-Ruiz, Sergio
dc.creatorWeiler, Thomas J.
dc.creatorWesolowski, Justin
dc.date2007-06-05
dc.date.accessioned2026-07-07T08:04:07Z
dc.date.available2026-07-07T08:04:07Z
dc.descriptionTeV gamma-rays can result from the photo-de-excitation of PeV cosmic ray nuclei after their parents have undergone photo-disintegration in an environment of ultraviolet photons. This process is proposed as a candidate explanation of the recently discovered HESS source at the edge of Westerlund 2. The UV background is provided by Lyman-alpha emission within the rich O and B stellar environment. The HESS flux results if there is efficient acceleration at the source of lower energy nuclei. The requirement that the Lorentz-boosted ultraviolet photons reach the Giant Dipole resonant energy (~ 20 MeV) implies a strong suppression of the gamma-ray spectrum compared to an E_γ^{-2} behavior at energies below about 1 TeV. This suppression is not apparent in the lowest-energy Westerlund 2 datum, but will be probed by the upcoming GLAST mission.
dc.descriptionTo be published in Proceedings of the 30th International Cosmic Ray Conference, July 3 - 11, 2007, Merida, Yucatan, Mexico
dc.identifierhttps://arxiv.org/abs/0706.0517
dc.identifierhttp://arxiv.org/abs/0706.0517
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/129835
dc.subjectAstrophysics
dc.titleTeV gamma-rays from photo-disintegration/de-excitation of nuclei in Westerlund 2
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