Other
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212l..63l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 212, Mar. 1, 1977, p. L63-L66.
Other
103
Binary Stars, Gamma Rays, Pulsars, Radiant Flux Density, X Ray Sources, Stellar Models, X Ray Telescopes
Scientific paper
Energetic (exceeding 35 MeV) gamma-rays have been observed from the direction of Cygnus X-3 with the SAS-2 gamma-ray telescope. The statistical significance of the excess above the galactic and diffuse radiation is approximately 4.5 sigma. In addition, the gamma-ray flux is modulated at the 4.8-hr period observed in the X-ray and infrared regions, and within the statistical error is in phase with this emission. The flux above 100 MeV has an average value of about 4.4 millionths photon/sq cm per sec. If the distance to Cygnus X-3 is 10 kpc, this flux implies a luminosity of more than 10 to the 37th power erg/s if the radiation is isotropic and about 10 to the 36th power erg/s if the radiation is restricted to a cone of 1 steradian, as it might be in a pulsar. Upper limits are presented for the gamma-ray flux from other known or suspected periodic X-ray sources.
Fichtel Carl E.
Hartman Robert C.
Kniffen Donald A.
Lamb Richard C.
Thompson Daniel J.
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