300 GeV gamma rays from VELA X-1

Details 300 GeV gamma rays from VELA X-1 300 GeV gamma rays from VELA X-1

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..967c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 967-970. Research supported by SERC.

Mathematics

Probability

19

Eclipsing Binary Stars, Gamma Rays, Pulsars, X Ray Binaries, Emission Spectra, Stellar Magnetic Fields, Stellar Mass, Stellar Mass Accretion

Scientific paper

The high-mass X-ray binary Vela X-1 has been observed using the Narrabri 300 GeV gamma-ray telescope. The results show evidence for pulsed very high energy (VHE) gamma-ray emission, with a conservative overall Rayleigh chance probability of 0.00011. The long-term period derivative during our observations of 1986-1988 was negative, indicating a spin-up similar to that noted between 1975 and 1979. The time-averaged luminosity in VHE gamma rays is estimated to be about 3.6 x 10 to the 34th ergs/s.

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