Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..267b&link_type=abstract
Nature (ISSN 0028-0836), vol. 318, Nov. 21, 1985, p. 267-269.
Astronomy and Astrophysics
Astronomy
4
Cosmic X Rays, Galactic Cosmic Rays, Milky Way Galaxy, Radiation Distribution, Spaceborne Astronomy, Astronomical Models, Diffuse Radiation, Exosat Satellite, Synchrotron Radiation
Scientific paper
Recent observations with the Exosat X-ray satellite have confirmed the existence of an apparently diffuse galactic ridge of emission extending over the inner Galaxy latitude about 55 deg and confined to about + or - 2 deg in galactic latitude. On the basis of measurements carried out in the galactic plane at latitude about 55 deg it was proposed previously that the diffuse galactic X-ray flux known at that time could be understood in terms of the synchrotron radiation of cosmic-ray electrons in the galactic magnetic field. The more extensive Exosat measurements fit nicely into this picture and the X-ray-producing electrons can now be readily understood as being secondary to the ultra-high-energy protons, which are themselves generated in galactic objects as epitomized by the recently discovered Cygnus X-3. It is shown here that, on this model, the number of Cyg X-3-like objects present in the Galaxy at any one time, averaged over the past 1000 yr or so, is about 30.
Bhat C. L.
Kifune Tadashi
Wolfendale Arnold W.
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