A Search for Ultra-High Energy Gamma Rays from EGRET Blazars

Details A Search for Ultra-High Energy Gamma Rays from EGRET Blazars A Search for Ultra-High Energy Gamma Rays from EGRET Blazars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2108c&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #21.08; Bulletin of the American Astronomical Society, Vol. 24, p.1156

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Scientific paper

Recently, the EGRET experiment aboard the Compton Gamma Ray Observatory has reported the detection of strong episodic emission from over 15 extra-galactic sources, typically radio-loud quasars and BL Lac objects. These sources are generally classified as ``blazars'', with significant gamma-ray energy which may be beamed towards the observer. At least one of these objects, Mrk 421, has also been detected at energies ~ 1 TeV by the Whipple observatory. Depending on the details of intergalactic absorption, it may be possible to detect such sources at energies above 50 TeV with large air shower arrays. We present a progress report on a search for Ultra High Energy (UHE) gamma rays from extra-galactic sources, such as the EGRET blazars, using the UMC air shower facility at Dugway, Utah. The facility is comprised of the large-area Chicago Air Shower Array (CASA) operating in coincidence with the underground Michigan Muon array (MIA). We describe our analysis approach for Mrk 421 and other AGN which are under observation by CASA-MIA in the northern hemisphere. We anticipate a sensitivity of ~ 3*E(-14) ph cm(-2) s(-1) above 80 TeV to flux from Mrk 421 after one full year's observations.

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