EGRET DETECTION OF THE BLAZAR PKS 0420-014

摘要

During its full-sky survey, the EGRET high-energy instrument aboard the Compton Gamma-Ray Observatory detected gamma-ray emission in the energy range above 30 MeV from a source identified as the blazar PKS 0420-014. This object was observed during two separate viewing periods in 1992 February/March and May/June. An intensity decrease above 100 MeV of a factor of at least 1.5 from a maximum of (5.0 ± 1.4) x 10~(-7) photons cm~(-2) s~(-1) was observed during that time interval indicating extensive variability. The photon spectrum in the range between 30 and 10,000 MeV at the time of the maximum intensity is well represented by a power law with an exponent of -1.9 ± 0.3. Some similarities with other EGRET detected blazars are briefly discussed.