Early star formation traced by the highest redshift quasars

Details Early star formation traced by the highest redshift quasars Early star formation traced by the highest redshift quasars

2003-07-12

arxiv.org/abs/astro-ph/0307264v2

Astrophys.J.596:L155-L158,2003

Astronomy and Astrophysics

Astrophysics

Replaced to match the accepted version (ApJL in press), 5 pages

Scientific paper

10.1086/379600

The iron abundance relative to alpha-elements in the circumnuclear region of quasars is regarded as a clock of the star formation history and, more specifically, of the enrichment by SNIa. We investigate the iron abundance in a sample of 22 quasars in the redshift range 3.06. We also detect a population of weak iron emitters at z~4.5, which are possibly hosted in systems that evolved more slowly. Alternatively, the trend of the FeII/MgII ratio at high redshift may reflect significantly different physical conditions of the circumnuclear gas in such high redshift quasars.

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