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arXiv:0706.0517 (astro-ph)
[Submitted on 5 Jun 2007]

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

Authors:Luis A. Anchordoqui, John F. Beacom, Yousaf M. Butt, Haim Goldberg, Sergio Palomares-Ruiz, Thomas J. Weiler, Justin Wesolowski
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Abstract: TeV 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_\gamma^{-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.
Comments: To be published in Proceedings of the 30th International Cosmic Ray Conference, July 3 - 11, 2007, Merida, Yucatan, Mexico
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0517 [astro-ph]
  (or arXiv:0706.0517v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0517

Submission history

From: Luis Anchordoqui [view email]
[v1] Tue, 5 Jun 2007 01:00:35 UTC (31 KB)
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