Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..774c&link_type=abstract
Astrophysical Journal v.454, p.774
Astronomy and Astrophysics
Astronomy
17
Cosmology: Diffuse Radiation, Galaxy: Center, Gamma Rays: Theory, Radiation Mechanisms: Nonthermal
Scientific paper
By using the PYTHIA version of the Lund Monte Carlo program, we study the photon yield of proton-proton collisions in the energy range between 10 GeV and 1 TeV. The resulting photon spectrum turns out to scale roughly with incident energy. Then, by folding the energy spectrum of cosmic-ray protons with the distribution of H I and CO, the Galactic diffuse emission of γ-rays above 100 GeV is mapped. Prospects for observing that diffuse radiation with atmospheric Cerenkov telescopes are discussed. Present instruments are able to detect the γ-ray glow of the Galactic center. The latter will be mapped by the next generation of telescopes if their energy threshold is decreased. However, a detailed survey of the Galactic ridge will be a real challenge, even in the long term. The MILAGRO project seems more appropriate. Finally, we investigate the γ-ray emission from weakly interacting massive particles clustering at the Galactic center. It has been speculated that those species are a major component of the halo dark matter. We show that their γ-ray signal is swamped in the Galactic diffuse radiation and cannot be observed at TeV energies.
Chardonnet Pascal
Grenier Isabelle
Salati Pierre
Silk Joseph
Smoot George
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