Metals and dust in high redshift AGNs

Details Metals and dust in high redshift AGNs Metals and dust in high redshift AGNs

2006-03-10

arxiv.org/abs/astro-ph/0603261v1

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures, invited talk at the Workshop "AGN and galaxy evolution", Specola Vaticana, Castel Gandolfo, Italy, 3-6 Oc

Scientific paper

We summarize some recent results on the metallicity and dust properties of Active Galactic Nuclei (AGN) at high redshift (110). The properties of dust in high-z QSOs are discussed within the context of the dust production mechanisms in the early universe. The dust extinction curve is observed to evolve beyond z>4, and by z~6 it is well described by the properties expected for dust produced by SNe, suggesting that the latter is the main mechanism of dust production in the early universe. We also show that the huge dust masses observed in distant QSOs can be accounted for by SN dust within the observational constraints currently available. Finally, we show that QSO winds, which have been proposed as an alternative mechanism of dust production, may also contribute significantly to the total dust budget at high redshift.

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