Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ncimc...8..379p&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 8, July-Aug. 1985, p. 379-397.
Astronomy and Astrophysics
Astronomy
2
Background Radiation, Cosmology, Diffuse Radiation, Galaxies, Intergalactic Media, Ultraviolet Astronomy, Hydrogen Clouds, Interstellar Matter, Radiant Flux Density, Relic Radiation, Ultraviolet Spectra
Scientific paper
The intensity of diffuse extragalactic background radiation is determined by the integrated emission of all sources along a given line of sight through the universe and by absorption due to intervening cool gas and dust. Due to red-shift and lookback-time effects, more distant objects contribute at a given wavelength today with light emitted at earlier epochs at shorter wavelengths. Possible sources of ultraviolet (100-3000) A emission include, but may not be restricted to, galaxies and quasars, a lukewarm or photoionized dense intergalactic medium and a cosmological sea of decaying massive neutrinos and photinos formed in the hot big bang. The resultant complex spatial intensity pattern and spectral distribution will appear superimposed on an intense galactic emission source whose main characteristics have yet to be clearly and satisfactorily established. Although substantial progress has been made recently in understanding galactic emission mechanisms, the remaining uncertainties substantially limit the accuracy with which a cosmologically significant signal may be disentangled from the diffuse galactic background 'noise'.
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