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| Paper: |
The Cycle of Dust in the Milky Way: Clues from the High-Redshift and Local Universe |
| Volume: |
414, Cosmic Dust—Near and Far |
| Page: |
183 |
| Authors: |
Dwek, E.; Galliano, F.; Jones, A. |
| Abstract: |
Models for the evolution of dust can be used to predict global evolutionary trends of dust abundances with metallicity and examine the relative importance of dust production and destruction mechanisms. Using these models, we show that the trend of PAH abundances with metallicity is the result of the delayed injection of carbon dust that formed in low mass AGB stars into the interstellar medium. The evolution of dust composition with time will have important consequences for determining the opacity of galaxies and their reradiated thermal IR emission. Dust evolution models must therefore be an integral part of population synthesis models, providing a self-consistent link between the stellar and dust emission components of the SED of galaxies. We also use our dust evolution models to examine the origin of dust at redshifts > 6, when only supernovae and their remnants could have been, respectively, their sources of production and destruction. Our results show that unless an average supernova produces between 0.1 and 1 Msun of dust, alternative sources will need to be invoked to account for the massive amount of dust observed at these redshifts. |
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