Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401l..61l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L61-L64.
Astronomy and Astrophysics
Astronomy
71
Bl Lacertae Objects, Emission Spectra, Gamma Ray Astronomy, Markarian Galaxies, Astronomical Observatories, Gamma Ray Spectra, Telescopes
Scientific paper
Gamma radiation in the energy range from 50 MeV to well over 1 GeV has been observed from the direction of the BL Lac object Markarian 421 by the Energetic Gamma Ray Experiment Telescope on the Compton Observatory during the period 1991 June 27-July 11. The source flux is weak, but still statistically significant at the level of 10 exp -5; the integrated photon flux above 100 MeV is (1.4 +/- 0.3) x 10 exp -7/sq cm s. The differential photon energy spectrum can be represented by a power law with exponent 1.96 +/- 0.14. This is the first detection of gamma-ray emission from a BL Lac object.
Bertsch David L.
Chiang James
Fichtel Carl E.
Hartman Robert C.
Hunter Stan D.
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