Synthetic Galaxy Spectra in Presence of Dust: From the UV to the Far Infrared

Mathematics – Logic

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Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Infrared Emission, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae

Scientific paper

We present our spectrophotometric model for galaxies of different morphological type. The galaxy models we are dealing with contain three components. First, the diffuse ISM, made of gas and dust. The model for the dusty ISM adopted for galaxies has been presented and discussed in detail in Piovan et al., in which we have considered and amalgamated two models of emission and extinction. Second, the large complexes of MCs in which active star formation occurs: the SEDs emitted by young OB stars are severely affected by the dusty MCs environment around them and skewed toward the IR as discussed in Piovan et al. Third, the populations of stars that are free from their parental molecular clouds and no more embedded in a dusty environment. These stars can be subdivided in intermediate age stars of suitable mass characterized by the AGB phase, where AGB stars are obscured by their own dust shells as described in Piovan et al., and old stars which shine as bare objects. The total amounts of stars, MCs and ISM present in the galaxy at a certain age is spread over the galaxy volume and the interaction between the physical components of the galaxy is taken into account to get the total galaxy SED, following the recipes by Piovan et al. The model is successfully applied to reproduce the SEDs of some galaxies of the local universe of different morphological type.

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