First observation of ultra-high-energy gamma rays from LMC X-4

Details First observation of ultra-high-energy gamma rays from LMC X-4 First observation of ultra-high-energy gamma rays from LMC X-4

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315..205p&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, May 16, 1985, p. 205-207. Research supported by the Australian Research Grants Committee.

Astronomy and Astrophysics

Astronomy

62

Energetic Particles, Gamma Ray Astronomy, Neutron Stars, Stellar Radiation, X Ray Astronomy, Eclipsing Binary Stars, Stellar Motions, X Ray Stars

Scientific paper

Ultrahigh energy (UHE) gamma rays have recently been observed from Cygnus X-3 and from Vela X-1. Data from the University of Adelaide air-shower array at Buckland Park taken over a three-year period have been analyzed to search for evidence of UHE gamma ray emission from additional neutron star binary X-ray sources having known orbital periods. The results of this research are presented, and the detection of UHE gamma rays from LMC X-4 above 10 to the 16th eV with an integral flux of (4.6 + or - 1.7) x 10 to the -11th photons/sq m/s is reported. This is the first extragalactic object to be positively detected at these energies.

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