Evidence for a variable flux of gamma rays exceeding 10 to the 11th power eV from NP 0532

Details Evidence for a variable flux of gamma rays exceeding 10 to the 11th power eV from NP 0532 Evidence for a variable flux of gamma rays exceeding 10 to the 11th power eV from NP 0532

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..592g&link_type=abstract

Astrophysical Journal, vol. 209, Oct. 15, 1976, pt. 1, p. 592-601. Research supported by the Smithsonian Institution Hodgkins F

Astronomy and Astrophysics

Astrophysics

34

Cerenkov Counters, Crab Nebula, Gamma Rays, Pulsars, Radiant Flux Density, X Ray Sources, Histograms, Light Curve, X Ray Spectra

Scientific paper

Final results are reported for an arrival-time phase analysis of five years of observations of the Crab pulsar (NP 0532) at gamma-ray energies exceeding 10 to the 11th power eV. All the observations employed variations of the atmospheric Cerenkov technique at a height of 2.3 km. Each of the six detection modes are described, and several of the observations are summarized. The results are found to be consistent with the existence of a pulsed gamma-ray flux at energies exceeding 8 by 10 to the 11th power eV which is variable in both phase and amplitude on a time scale of months. Possible emission mechanisms are considered.

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