Diffuse gas in the Galaxy: the Galactic Plane

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Preliminary results are reported from an ISO Active Archive Phase Project dedicated to the study of diffuse gas in the Galaxy. We use LWS observations of galactic lines of sight devoid of any known energetic sources. The LWS observations cover the far-infrared dust continuum emission and the major cooling fine-structure lines of the diffuse interstellar medium, i.e. [OI] 63 and 145 μm, [CII] 158 μm and [NII] 122 μm. Results from a sample of 144 lines of sight in the galactic plane are presented. The four main cooling lines prove to be well correlated with the dust continuum emission over four orders of magnitude in the FIR emission. Preliminary interpretations of these results are given together with the main perspectives of the study.

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