Mathematics – Logic
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10792d&link_type=abstract
HST Proposal ID #10792. Cycle 15
Mathematics
Logic
Scientific paper
We propose to observe four high-redshift quasars z=6 in the NIR in order to estimate relative Fe/Mg abundances and the central black hole mass. The results of this study will critically constrain models of joint quasar and galaxy formation, early star formation, and the growth of supermassive black holes. Different time scales and yields for alpha-elements like O or Mg and for iron result into an iron enrichment delay of ~0.3 to 0.6 Gyr. Hence, despite the well-known complexity of the FeII emission line spectrum, the ratio iron/alpha - element is a potentially useful cosmological clock. The central black hole mass will be estimated based on a recently revised back hole mass - luminosity relationship. The time delay of the iron enrichment and the time required to form a supermassive black hole logM>8 Msol, tau ~0.5Gyr as evidenced by quasar activity will be used to date the beginning of the first intense star formation, marking the formation of the first massive galaxies that host luminous quasars, and to constrain the epoch when supermassive black holes start to grow by accretion.
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