Detection of Multi-TeV Emission from Markarian 421

Details Detection of Multi-TeV Emission from Markarian 421 Detection of Multi-TeV Emission from Markarian 421

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...481..758k&link_type=abstract

Astrophysical Journal v.481, p.758

Astronomy and Astrophysics

Astronomy

33

Galaxies: Bl Lacertae Objects: Individual Name: Markarian 421, Gamma Rays: Observations

Scientific paper

Gamma rays with energies exceeding 5 +/- 1.5 TeV have been detected from Markarian 421 using the Whipple Observatory's 10 m gamma -ray telescope. These observations employ a new technique: the so-called large zenith-angle technique. Because they are taken at large zenith angles, the observations yield high statistics data on the multi-TeV part of the spectrum and are well suited for examining the question of a possible energy cutoff. Observations taken during high states on 1995 June 20, 21, and 28 show no evidence for a spectral break. These results conflict with a previous interpretation of the Markarian 421 energy spectrum in which a cutoff due to gamma -ray absorption in extragalactic space was postulated.

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