Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-10
Astronomy and Astrophysics
Astrophysics
4 pages, 7 figures, Proceedings of the conference "20th European Cosmic Ray Symposium in Lisbon, Portugal", September 5-8, 200
Scientific paper
The flux upper limits of the diffuse gamma rays, from the inner and outer Galactic planes, are revised by factors of 4.0$\sim$3.7 for mode energies 3$\sim$10 TeV, respectively, by using the simulation results of the effective area ratios for gamma-ray induced showers and cosmic-ray induced ones in the Tibet air shower array. In our previous work, (Amenomori et al., ApJ, 580, 887, 2002) the flux upper limits were deduced only from the flux ratio of air showers generated by gamma rays versus cosmic rays. The details of the simulation are given in the paper (Amenomori et al., Advances in Space Research, 37, 1932, 2006). The present result using the same data as in ApJ suggests that the spectral index of source electrons is steeper than 2.2 and 2.1 for the inner and outer Galactic planes, respectively.
Amenomori Michihiro
The Tibet AS Gamma Collaboration
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