Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228l..29b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 228, Feb. 15, 1979, p. L29-L32.
Astronomy and Astrophysics
Astrophysics
9
Cosmic X Rays, Magellanic Clouds, Radiant Flux Density, X Ray Absorption, Abundance, Cosmic Gases, Hydrogen Atoms, Interstellar Gas, Luminous Intensity, Thermal Emission
Scientific paper
The contribution to the diffuse X-ray background near 1 keV cosmic (extragalactic) origin is poorly known. Data from a slow scan across the Small Magellanic Cloud by the Wisconsin soft X-ray experiment on OSO 8 are analyzed to search for absorption of a possible cosmic component to the diffuse flux. No indication of an X-ray shadow near 1 keV is found, setting an upper limit to the intensity of the flux originating beyond the SMC that is inconsistent with a cosmic spectrum of 11 E to the -1.4 photons per (sq cm s sr keV), even allowing for depletion of the absorbing elements in the SMC. Unless emission by the SMC or an upward fluctuation in the galactic or cosmic diffuse flux at the position of the SMC has canceled out the expected absorption, the contribution to the diffuse flux at 1 keV from beyond the SMC must be less than 50% of that expected for an extrapolated E to the -1.4 source spectrum.
Bunner Alan N.
Nousek John A.
Sanders Wilton T.
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