An Ultra-Faint Galaxy Count and Redshift Survey Using Cluster Lenses

Details An Ultra-Faint Galaxy Count and Redshift Survey Using Cluster Lenses An Ultra-Faint Galaxy Count and Redshift Survey Using Cluster Lenses

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6488s&link_type=abstract

HST Proposal ID #6488

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Hst Proposal Id #6488 Cosmology

Scientific paper

The high surface density { 200 arcmin^-2} of the faintest sources revealed via ultra-deep CCD images suggests we may have detected a population of high redshift pre-galactic halos. The abundance, clustering and other properties of such sources would be valuable constraints on theories of structure formation. To verify the hypothesis redshifts and hence luminosities are required for sources well beyond the spectroscopic limits of even 10-m class telescopes. By using the gravitational distortion induced by foreground rich clusters, we demonstrate that it is possible to secure reliable distances at these limits by analysing the images of background sources viewed through a highly-constrained cluster lens. From HST images of a single cluster, the redshift distribution of 60 objects to R=25 has already been determined. A further development is the use of lensing to provide constraints on source counts and redshifts to yet fainter limits, R 29, by analysing the location and abundance of highly-magnified `pairs'. The combination of both techniques, made possible only with HST, provides the only avenue towards constraining a pre-galactic halo population. We propose to apply both techniques to a further cluster enabling us to 1} compare our lensing-derived N{z} at R<=23 with spectroscopic results, 2} extend the inversion depth to R=26, and 3} analyse the frequency and geometry of faint pairs to constrain the distance and abundance of sources to R 29.

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