Gamma-ray observations of Cygnus X-1 and Cygnus X-3 using a coded-aperture telescope

Details Gamma-ray observations of Cygnus X-1 and Cygnus X-3 using a coded-aperture telescope Gamma-ray observations of Cygnus X-1 and Cygnus X-3 using a coded-aperture telescope

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..317m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 317-322.

Astronomy and Astrophysics

Astronomy

16

Cygnus Constellation, Gamma Ray Astronomy, Gamma Ray Telescopes, X Ray Binaries, Angular Resolution, Apertures, Balloon-Borne Instruments, Photons

Scientific paper

A balloon-borne coded-aperture telescope, measuring gamma-ray photons in the 160 keV to 9.3 MeV range, was used to observe the Cygnus region of the sky on October 1 and 2, 1984. In the 2-9.3-MeV band, evidence is found for a hard spectral component with a mean flux level at the top of the atmosphere of 7.4 + or - 2.5 x 10 to the -7th photons/sq cm per s per keV, inconsistent with the predictions of the inverse Compton models normally used to describe the X-ray emission. Both Cyg X-1 and Cyg X-3 could be observed simultaneously with the telescope. The results are used to establish 1-sigma upper flux limits on the spectral emission from Cyg X-3.

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