Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..628p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.4/OCT15, P. 628, 1990
Astronomy and Astrophysics
Astronomy
16
Scientific paper
Previous work on electron-photon cascades through the cosmic-microwave-background radiation initiated by primary γ-rays and electrons is extended to a three-dimensional calculation which includes synchrotron radiation. New functions which enable synchrotron photon spectra to be calculated more easily are described. These functions are used in a Monte Carlo cascade simulation to predict the size and intensity of synchrotron haloes surrounding sources of ultra-high-energy γ-rays. I conclude that these haloes may be observed with the next generation of X-ray and γ-ray telescopes. A fraction of the X-ray flux from the synchrotron halo of Cygnus X-3 should have been within the fields of view of previous X-ray telescopes observing the source. The observed hard X-ray spectrum of Cygnus X-3 at minimum flux in the 4.8-hr cycle is used, together with the present calculations, to obtain an upper limit to the time-averaged ultra-high-energy γ-ray flux from Cygnus X-3. A published upper limit to the ratio of the ultra-high-energy γ-ray flux to cosmic-ray flux from the galactic plane is used in conjunction with the present calculations to exclude electrons from ultra-high-energy γ-ray sources as the origin of the diffuse galactic ridge X-ray emission.
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