Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei

Details Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..832a&link_type=abstract

Astrophysical Journal v.418, p.832

Astronomy and Astrophysics

Astronomy

13

Galaxies: Active, Galaxies: Bl Lacertae Objects: General, Gamma Rays: Observations

Scientific paper

The CYGNUS air-shower array has been used to search for emission of ultra-high-energy gamma radiation from 13 active galactic nuclei (AGNs) that were detected by EGRET. The data set spans the period 1986 April 2 to 1993 January 1. The data set has been searched for continuous emission, for emission on the time scale of 1 week, and for emission on the time scale of 1 day. No evidence for emission from any of the AGNs on any of the time scales examined was found. The 90% Confidence Level (CL) upper limit to the continuous flux from Mrk 421 above 50 TeV is 7.5 × 10-14 cm-2 s-1.

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