The interstellar radiation field between 912 A and 2740 A

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Diffuse Radiation, Galactic Radiation, Interstellar Matter, Interstellar Radiation, Ultraviolet Spectra, Absorption Spectra, B Stars, Background Radiation, Cosmic Dust, Galactic Structure, Hydrogen Atoms, Interstellar Extinction, O Stars, Sky Surveys (Astronomy), Stellar Atmospheres, Stellar Spectra

Scientific paper

The average intensity of the interstellar diffuse radiation field between 912 A and 2740 A has been calculated on the basis of a galactic model but using, as far as possible, observational inputs for ultraviolet stellar spectra and the properties of the interstellar medium. For the former, the recent observations of the ultraviolet sky-survey telescope (S2-68) on the TD-1 satellite are used down to 1350 A and extrapolated down to 912 A with the aid of line-blanketed models of O and B stellar atmospheres. For the latter, both TD-1 and OAO observations were used for the extinction and scattering properties of the dust. An additional interstellar effect included in the calculations is the strong absorption in the Lyman series of atomic hydrogen. A comparison of the computed flux with wide-field observations of the ultraviolet background gives reasonable agreement.

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