TeV γ rays and neutrinos from photodisintegration of nuclei in Cygnus OB2

被引：56

作者：

Anchordoqui, Luis A.

Beacom, John F.

Goldberg, Haim

Palomares-Ruiz, Sergio

Weiler, Thomas J.

机构：

[1] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA

[2] Ohio State Univ, Dept Phys & Astron, CCAPP, Columbus, OH 43210 USA

[3] Northeastern Univ, Dept Phys, Boston, MA 02115 USA

[4] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[5] Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW D | 2007年 / 75卷 / 06期

关键词：

D O I：

10.1103/PhysRevD.75.063001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

TeV gamma-rays may provide significant information about high energy astrophysical accelerators. Such gamma-rays can result from the photo-de-excitation of PeV 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 HEGRA source at the edge of the Cygnus OB2 association. The Lyman-alpha background is provided by the rich O and B stellar environment. It is found that (1) the HEGRA flux can be obtained if there is efficient acceleration at the source of lower energy nuclei; (2) the requirement that the Lorentz-boosted ultraviolet photons can excite the giant dipole resonance implies a strong suppression of the gamma-ray spectrum compared to an E-gamma(-2) behavior at energies less than or similar to 1 TeV (some of these energies will be probed by the upcoming GLAST mission); (3) a TeV neutrino counterpart from neutron decay following helium photo-disintegration will be observed at IceCube only if a major proportion of the kinetic energy budget of the Cygnus OB2 association is expended in accelerating nuclei.

引用

页数：19

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