Mathematics – Logic
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...44c&link_type=abstract
NOAO Proposal ID #1999B-0044
Mathematics
Logic
Scientific paper
The elemental abundances of high-redshift QSOs place important constraints on their ages, and thereby the fundamental cosmological parameters. The presence of strong Fe II emission in particular places a limit of ~ 1.5 Gyr on the age of these objects, that being the timescale for the expected production of this element by Type Ia supernovae. The opportunity to extend the search for Fe II emission in QSOs to z ~eq 5 has recently been presented by the discovery of two relatively bright (I ~eq 19.8) QSOs at this redshift in the Sloan Digital Sky Survey. Specifically, the Fe II emission complex centered at 2500 Å along with the Mg II 2800 Å line will at that redshift fall directly into the H band. We thus propose to use the CRSP spectrometer on the Mayall 4m telescope to obtain low-resolution IR spectra of these objects from which we will obtain estimates of the relative strength of the Fe II and Mg II lines. In addition to refining estimates of Ω_0, the age-dating of objects at this redshift will help to determine whether (Lambda) is non-zero, and to probe the link between star formation and the QSO phenomenon.
Corbin Michael
Joyce Richard R.
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