Present and Future Gamma-Ray Probes of the Cygnus OB2 Environment

Details Present and Future Gamma-Ray Probes of the Cygnus OB2 Environment Present and Future Gamma-Ray Probes of the Cygnus OB2 Environment

2009-07-02

arxiv.org/abs/0907.0395v2

Phys.Rev.D80:103004,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pp, 2 figs. Matching version publihed in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.103004

The MAGIC Collaboration has provided new observational data pertaining to the TeV J2032+4130 gamma-ray source (within the Cygnus OB2 region), for energies E_gamma >400 GeV. It is then appropriate to update the impact of these data on gamma-ray production mechanisms in stellar associations. We consider two mechanisms of gamma-ray emission, pion production and decay (PION) and photo-excitation of high-energy nuclei followed by prompt photo-emission from the daughter nuclei (A*). We find that while the data can be accommodated with either scenario, the A* features a spectral bump, corresponding to the threshold for exciting the Giant Dipole Resonance, which can serve to discriminate between them. We comment on neutrino emission and detection from the region if the PION and/or A* processes are operative. We also touch on the implications for this analysis of future Fermi and Cerenkov Telescope Array data.

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