A search for ultra-high-energy gamma rays from active galactic nuclei

Details A search for ultra-high-energy gamma rays from active galactic nuclei A search for ultra-high-energy gamma rays from active galactic nuclei

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........24c&link_type=abstract

PhD Dissertation, Michigan Univ. Ann Arbor, MI United States

Astronomy and Astrophysics

Astronomy

2

Active Galactic Nuclei, Cosmic Ray Showers, Gamma Rays, Gamma Ray Astronomy, Galactic Radiation, Microwave Attenuation, Radiation Counters

Scientific paper

Extensive air shower data collected using the Chicago Air Shower Array-Michigan Array (CASA-MIA) detector are examined for evidence of gamma ray emission at median energies above 50 TeV from the directions of twenty-six active galactic nuclei. These objects have all been detected previously at energies above 100 MeV by the Energetic Gamma Ray Experiment Telescope aboard the Compton Gamma Ray Observatory. No evidence of continuous or short-term gamma ray emission is found for data collected between March 1990 and December 1993. The flux limits calculated from this data are consistent with microwave attenuation of the gamma ray signal.

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