Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..634a&link_type=abstract
The Astrophysical Journal, vol. 429, no. 2, pt. 1, p. 634-637
Other
6
Active Galactic Nuclei, Continuous Radiation, Cosmic Rays, Flux Density, Gamma Rays, Markarian Galaxies, Northern Sky, Quasars, Computerized Simulation, Fourier Transformation, Monte Carlo Method, Scintillation Counters, Tibet
Scientific paper
A search for 10 Tera eV gamma-ray emission from 15 active galactic nuclei (AGNs) which were detected by energetic gamma-ray experiment telescope (EGRET) was made with the Tibet air shower array installed at an elevation of 4300 m above sea level. The data set, taken in the period from 18 Jun. 1990 - 29 Sep. 1992 has been used to search for continuous emission as well as emission on the timescale of 1 day. No evidence for emission from any of the AGNs on any of the time scales examined was found. The 95% confidence level upper limit to the continuous flux is presented on each source, and in particular the result for Markarian 421 is compared with other experiments. Further observation of gamma-rays at energies around 10 TeV from nearby AGNs will provide reliable information on the strength of the intergalactic backgroud photon field.
Amenomori Michihiro
Cao Zhoujian
Dai Ben Zhong
Ding Lin-Kai
Feng Yue-Xing
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