Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..114g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 114-121.
Astronomy and Astrophysics
Astronomy
33
Cosmic Ray Showers, Gamma Ray Astronomy, Pulsars, X Ray Binaries, Exosat Satellite, Light Curve, Power Spectra, Pulsed Radiation, Radiant Flux Density
Scientific paper
The X-ray binary pulsar Hercules X-1 was observed during the spring of 1984 using the atmospheric Cherenkov technique with the Whipple Observatory 10 m reflector. Three episodes of pulsed emission, comprising about 8 percent of the total observation time, were detected at primary photons energies above 2.5 x 10 to the 11th eV. The emission occurred on time scales of a few hours or less, with possible correlations to mass-transfer episodes detected in X-rays, and to the 35 day X-ray intensity cycle. The average integral flux for the three outbursts reported here is 2.8 x 10 to the -10th/sq cm/s, implying short-term gamma-ray luminosities of over 2 x 10 to the 35th ergs/s.
Cawley Michael F.
Fegan David J.
Gibbs Kenneth G.
Gorham Peter. W.
Kenny Stuart
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