300 GeV Gamma Rays from VELA X-1
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1989
- DOI:
- 10.1086/168077
- Bibcode:
- 1989ApJ...346..967C
- Keywords:
-
- Eclipsing Binary Stars;
- Gamma Rays;
- Pulsars;
- X Ray Binaries;
- Emission Spectra;
- Stellar Magnetic Fields;
- Stellar Mass;
- Stellar Mass Accretion;
- Astrophysics;
- GAMMA RAYS: GENERAL;
- STARS: INDIVIDUAL CONSTELLATION NAME: VELA X-1;
- X-RAYS: BINARIES