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The sudden appearance of dust in the early Universe
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Observations suggest that high-redshift galaxies are either very dusty or essentially dust free. The evolution from one regime to the other must also be very fast, since evolved and dusty galaxies show up at redshifts corresponding to a Universe which is only about 500 Myr old. In the present paper models which predicts the existence of an apparent dichotomy between dusty and dust-free galaxies at high redshift are considered. Galaxies become dusty as soon as they reach an evolved state and the transition is very rapid. A special case suggests that while stellar dust production is overall relatively insignificant -- contrary to what has been argued recently -- it can at the same time be consistent with efficient dust production in supernovae in the local Universe. Special attention will be given to the recent discovery of a dusty normal galaxy (A1689-zD1) at a very high redshift z = 7.5 +/- 0.2.
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Cited by 1 Pith paper
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The influence of a top-heavy integrated galactic IMF and dust on the chemical evolution of high-redshift starbursts
Chemical evolution models with an integrated galactic IMF show that high-z starburst abundances require either a very top-heavy IMF (beta<2) or strong dust depletion, with beta>=2 preferred if dust is significant.
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