From the very first PopIII to z~6 galaxies and quasars
Michele Trenti

High redshift observations are opening larger and larger windows on
galaxy formation and evolution in the first billion of years, with
very rare, bright quasars identified from all sky surveys and more
common galaxies observed through deep narrow beam programs, such as
GOODS and the UDF. By means of cosmological simulations of structure
formation we first quantify the typical systematic uncertainties in
the observed luminosity function due to cosmic variance, not only in
its normalization but also in the shape. We then discuss the link of
these z~6 galaxies and quasars with the very first PopIII stars formed
at z>40, which provide early seeding for chemical enrichment of the
interstellar medium and for the growth of supermassive BHs.