Detection of TeV Photons from Markarian 421

Details Detection of TeV Photons from Markarian 421 Detection of TeV Photons from Markarian 421

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2107k&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #21.07; Bulletin of the American Astronomical Society, Vol. 24, p.1155

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Scientific paper

Gamma-rays of energies > 0.5 TeV have been observed from the BL Lac galaxy Markarian 421 using the Whipple Observatory imaging gamma-ray telescope. The average flux of 1.5x10(-11) photons cm(-2) s(-1) is 0.3 times that of the Crab Nebula and represents a 6sigma excess over background. The observations were performed in March-June 1992. Mk421 (redshift z=0.031) is one of 16 galaxies seen at MeV-GeV energies by the EGRET detector aboard the Compton Observatory. We will report on observations of other active galaxies and quasars which are brighter than Mk421 at EGRET energies. These observations are consistent with suggestions that TeV photons are absorbed by infrared background radiation.

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