On the far-infrared diffuse galactic emission

Astronomy and Astrophysics – Astronomy

Scientific paper

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Diffuse Radiation, Far Infrared Radiation, Galactic Radiation, Infrared Astronomy, Interstellar Gas, Interstellar Radiation, Milky Way Galaxy, Approximation, Density Distribution, Interstellar Matter, Late Stars, Star Distribution

Scientific paper

Using recent work on the optical properties of the interstellar medium and on the structure and content of the galactic disk the total (wavelength-integrated) far-infrared (FIR) diffuse emission of the Galaxy is derived as a function of galactic longitude. A maximum intensity around l(II) equals 30 deg and a slow decrease around l(II) equals 45 deg are obtained, both primarily due to early-type stars in the spiral arms. The mean dust density averaged over cloud and inter-cloud regions is of moderate influence and there is no significant difference, whether part of the material is located in dense clouds or not. The transparency of the model allows one to verify that the uncertainties in most of the parameters do not influence the result very much. There exists quite good agreement between this work and observations performed so far, indicating that the FIR diffuse emission can be understood in terms of known distributions of stars and dust.

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