Star Formation History and Quasars at z ⪆ 5

Details Star Formation History and Quasars at z ⪆ 5 Star Formation History and Quasars at z ⪆ 5

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..117d&link_type=abstract

NOAO Proposal ID #2002B-0117

Physics

Scientific paper

Quasars at the highest redshifts (z⪆ 5) can probe the first star formation epoch in the early universe using the abundance ratio iron/(alpha) -elements. Enrichment time scales for iron are significantly different than for (alpha) -elements (e.g., oxygen, magnesium) leading to an enrichment delay of ~ 1 Gyr for iron. If FeII/MgII emission lines in high-redshift quasars (z ~eq 5) can be attributed to solar or higher Fe/(alpha) ratios, then we would have evidence for the first star formation epoch beginning at redshift z⪆ 10, corresponding to an age of the universe of a few 10^8 years (H_o=65 km s^-1 Mpc^-1, Ω_M=0.3, Ω_(Lambda)=0.7). We will measure for four high-redshift quasars the broad FeII emission features and the MgII 2798 emission. These quasar spectra will be analyzed by applying theoretical as well as empirical templates of FeII lines, and Balmer continuum emission. Of particular interest is SDSS1030+0524, the quasar with the highest currently known redshift (z=6.28), corresponding an age of ~ 850 Myr. A high FeII/MgII line ratio in this quasar might pose a challenge for models of cosmology and early structure/star formation.

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