The amplification by lensing effect of massive clusters
enables us to study faint background galaxies in the fields.
We have carried out a search for i-band dropout sources in
the cluster fields in which HST/ACS optical images and
ground-based J-band images have been obtained. These sources
are likely galaxies at redshift ~6. The distribution of
these sources will be compared with that in the deep fields
such as GOODS and UDF, to show the potential of using
clusters to extend our probe into the domain of even fainter
universe. Supported by NASA grant NAG5-7697.
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