Abstract
During a balloon flight in September 1979 of the MISO low-energy γ-ray telescope, the BL Lac-object MkN 501 was studied in the hard X-ray range above 30 keV and in the low energy γ-ray range up to 19 MeV. No statistically significant X- and γ-ray fluxes were detected. The implications of the upper limits obtained are discussed in the light of the relativistic jet theories recently proposed.
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