Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7257s&link_type=abstract
HST Proposal ID #7257
Physics
Hst Proposal Id #7257
Scientific paper
The high surface density of faint sources seen in the Hubble Deep Field suggests that we may have detected a population of pre-galactic halos. Near-infrared observations of these objects will provide a robust estimate of the luminosity density in the distant universe, an important constraint on theories of galaxy formation. However, the spectroscopy needed to estimate the luminosities will be extremely difficult, even with 10-m telescopes. Although limited progress is possible from spectroscopy of brighter star-forming objects selected via Lyman breaks or [OII] emission, ultimately we must remove the bias towards star-forming galaxies inherent in such surveys. We have developed a technique for measuring redshifts for large samples of distant field galaxies through analyses of the gravitational lensing distortion produced by rich clusters of galaxies, for which highly constrained mass models have been constructed. The method has been successfully applied to several samples of arclets with I<=25 selected from WFPC-2. Moreover, ground-based spectroscopy of a brighter subset has verified the accuracy of the predicted redshifts. Here we propose to use NICMOS imaging to construct an H- selected sample of arclets. This will provide the first representative view of the distant field population, some 2 magnitudes fainter than possible with Keck. In conjunction with our WFPC-2 data, the redshifts, colours and luminosities will provide unbiased constraints on the field galaxy population in the important redshift range 1
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