First observation of gamma-rays from VELA X-1 at energies greater than 3 X 10 to the 15th eV

Details First observation of gamma-rays from VELA X-1 at energies greater than 3 X 10 to the 15th eV First observation of gamma-rays from VELA X-1 at energies greater than 3 X 10 to the 15th eV

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280l..47p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 280, May 15, 1984, p. L47-L50. Research supported b

Mathematics

Probability

91

Binary Stars, Cosmic Ray Showers, Energetic Particles, Gamma Rays, X Ray Sources, X Ray Stars, Luminosity, Probability Distribution Functions, Stellar Radiation

Scientific paper

The first observation of gamma-rays from Vela X-1 is reported. Data from the Buckland Park air shower array contain an excess of events from within 4 degrees if Vela X-1 with characteristics of gamma-ray initiated showers. These excess events are in phase with the orbital period. The probability of this detection occurring by chance is approximately 0.0001. The time-averaged gamma-ray flux above 3 x 10 to the 15th eV is (9.3 + or -3.4) x 10 to the -11th photons/sq m/s, corresponding to a luminosity of approximately 2 x 10 to the 34th erg/s per decade of energy at 3 x 10 to the 15th eV.

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