Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9413c&link_type=abstract
HST Proposal ID #9413
Computer Science
Hst Proposal Id #9413
Scientific paper
The elemental abundances of high-redshift QSOs provide an important probe of the early universe. The ratio of iron to alpha-process elements observed in all QSOs to z 4.5 in particular suggests that the gas has been enriched by Type Ia supernovae. Evidence of such enrichment in turn helps constrain the ages and masses of QSO host galaxies, which can be compared with the predictions of galaxy formation models under currently popular LambdaCDM cosmologies. With these motivations we propose to obtain NICMOS grism spectra of five bright {z^* 19} QSOs from z = 5.03 to z = 6.28 recently discovered in the Sloan Digital Sky Survey. Our main goal will be to measure the strength of the broad Fe II emission complex at 2500 Angstrom {rest} in these very young { 1 Gyr} objects, if it is present at all. With the exception of two objects at z = 5.99 and z = 6.28 it will also be possible to measure the Mg II Lambda2800 line. These measurements are impossible from the ground because of the atmospheric absorption bands in the near infrared. The Fe II / Mg II emission ratio will in turn be used to estimate the relative abundance of these elements in the objects, and to compare these abundances to those of QSOs at lower redshifts. The infrared brightness of the objects and reduced sky background will allow high signal-to-noise ratio spectra to be obtained in relatively short integration times {1 orbit per object}.
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