Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..515..139a&link_type=abstract
GeV-TeV GAMMA RAY ASTROPHYSICS WORKSHOP: Towards a Major Atmospheric Cherenkov Detector VI. AIP Conference Proceedings, Volume
Astronomy and Astrophysics
Astrophysics
6
Active And Peculiar Galaxies And Related Systems, Gamma-Ray
Scientific paper
The BL Lac object Mrk 501 came into a high flaring state in 1997, brightest in the sky at TeV energies. Using the air shower data obtained with a high density part of the Tibet II array, being operating at Yangbajing since 1996, we searched for γ-ray signals from this source during the period from February to August in 1997. The result shows a 3.7σ excess for showers with its mode energy 3 TeV for the whole period and 4.7σ excess for the period from April 7 to June 16. The estimated energy spectrum of γ rays is consistent with those obtained by imaging atmospheric Cherenkov detectors. .
Amenomori Michihiro
Ayabe S.
Cao P. Y.
Danzengluobu
Ding Lin-Kai
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