Dust attenuation UV (GALEX) vs. IR and its evolution with redshift

Computer Science

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Galaxies: Starburst, Ultraviolet: Galaxies, Infrared: Galaxies, Galaxies: Extinction

Scientific paper

GALEX observations in the Far UV and in the Near UV are complemented by visible Mid-/Far-IR data to constrain dust attenuation laws and the star formation history of galaxies. The main (non unexpected) result is that the use of Far-IR data greatly helps estimating the amount of dust attenuation in galaxies through the use of the FIR/UT flux ratio. In addition, by fitting models to our multi-wavelength sample of galaxies, separated into a UV-selected one and a FIR-selected one, we deduce dust attenuation laws that could have a wide range of characteristics in terms of the presence of a bump at 217.5nm and slope. Finally, we estimate the amount of dust attenuation in FUV as a function of the redshift and find a strong evolution towards higher dust attenuations. This work will be published in more detailed in Burgarella et al. (2005, in prep.) and Buat et al. (2005, in prep.).

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