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Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV
Grindlay, J. E.; Helmken, H. F.; Brown, R. H.; Davis, J.; Allen, L. R.
AA(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.), AB(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.), AC(Sydney, University, Sydney, Australia), AD(Sydney, University, Sydney, Australia), AE(Sydney, University, Sydney, Australia)
Astrophysical Journal, vol. 201, Oct. 1, 1975, pt. 1, p. 82-89. Research supported by the Smithsonian Institution, Australian Research Grants Committee, and University of Sydney (ApJ Homepage)
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NASA/STI Keywords:
Gamma Rays, High Energy Interactions, X Ray Astronomy, Cerenkov Radiation, Galactic Nuclei, Interferometers, Pulsars, Quasars, Radiation Detectors, Southern Hemisphere, X Ray Sources
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Results are reported for a series of observations of possible high-energy gamma-ray sources in the Southern Hemisphere. The observations were made using the Narrabri optical intensity interferometer as a sensitive detector of Cerenkov light from extensive air showers initiated by high-energy gamma rays. The candidate sources included Cen A, the Vela pulsar, supernova 1972e, quasar 3C 273, the galactic center, and Cen X-3, as well as several other pulsars and X-ray sources. Upper flux limits for each object are presented together with equivocal evidence for a variable pulsed flux from the Vela pulsar. The results of the survey show that detectable sources exist at photon energies in excess of 100 GeV and that a number of sources of hard X-rays and 100-MeV gamma rays are not strong sources of high-energy gamma rays.

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