Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2305a&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
1
Scientific paper
Diffuse gamma rays from the Galactic plane were searched combining the Tibet I I data with energies more than 4 TeV and I I I data obtained during 1999-2002 with energies more than 1.5 TeV. The Tibet I I I increased available data by a factor ˜1.8 than the Tibet I I only. The sky regions searched are the inner Galaxy, 20° < l < 55° , and outer Galaxy, 140° < l < 225° with the plane thickness |b| ≤ 2° , and the Cygnus region, 67° < l < 92° with |b| ≤ 5° . Although no significant excess was observed, the intensity upper limits are given with 99% confidence level at mode energies 3˜20 TeV, assuming a differential spectral index of -2.4. The present results give the most stringent upper limits on the inverse Compton model with a source electron spectral index of -2.0.
Amenomori Michihiro
Ayabe S.
Cui Shu-Wen
Danzengluobu
Ding Lin-Kai
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