Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9292f&link_type=abstract
HST Proposal ID #9292
Other
Hst Proposal Id #9292
Scientific paper
The discovery of a number of galaxies and quasars at redshifts greater than 5 has identified the z>5-6 epoch as key to understanding the earliest formation phases for galaxies. However, establishing the characteristics and properties of these earliest galaxies is proving to be a particularly difficult. They are faint, with I{AB} magnitudes around 26-27. Thus even with HST, substantial investments of time are needed to obtain high S/N images, while ground-based spectroscopy, even with 8-10 m class telescopes, has provided little more than redshifts. Establishing the physical properties of these galaxies will be a challenge for the foreseeable future. However, there is a subset of this high redshift population that is amenable to more detailed study. These are sources that have been strongly lensed by low redshift clusters. The best known such source is the arc G1 in the z=0.33 cluster CL1358+62. G1 is at z=4.92 and its high magnification allows a more detailed study of its structure and distribution of star forming regions than any other z 5 galaxy. There remains the possibility that a number of the other low redshift clusters with strong lensing also harbor high redshift objects {even higher than z 5}. The Advanced Camera provides an opportunity to search for potential z 6 or greater sources through its high throughput SDSS ``z'' filter {F850LP}. The combination of HST resolution and the high magnification in such lensing clusters could potentially lead to the detection of additional objects that could be studied in considerable detail. Or if such z>6 sources are intrinsically faint, lensing may provide the only practical means of their detection prior to even more sensitive telescopes and instruments in the future.
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