Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV

Details Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201...82g&link_type=abstract

Astrophysical Journal, vol. 201, Oct. 1, 1975, pt. 1, p. 82-89. Research supported by the Smithsonian Institution, Australian Re

Astronomy and Astrophysics

Astronomy

39

Gamma Rays, High Energy Interactions, X Ray Astronomy, Cerenkov Radiation, Galactic Nuclei, Interferometers, Pulsars, Quasars, Radiation Detectors, Southern Hemisphere, X Ray Sources

Scientific paper

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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