The role of the geometry and dust environment in stationary models of translucent interstellar clouds

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radiative Transfer, Ism: Clouds, Dust, Extinction, Ism: Molecules, Ultraviolet: Ism

Scientific paper

A full radiative transfer model is presented for the ultraviolet (UV) radiation impinging on an interstellar cloud of spherical or finite plane-parallel slab geometry containing gas and dust. The penetration of the UV photons is coupled to detailed chemical processes. Photodestruction rates of atomic and molecular species are calculated from the corresponding cross-sections. We show that CO line intensities are quite sensitive to geometrical effects and to the extinction curve in the far-UV.

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