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We use imaging obtained with the Hubble Space Telescope Wide Field Camera 3to search for z_850 dropouts at z~7 and J_110 dropouts at z~9 lensed by theBullet Cluster. In total we find 10 z_850 dropouts in our 8.27 arcmin^2 field.Using magnification maps from a combined weak and strong lensing massreconstruction of the Bullet Cluster and correcting for estimated completenesslevels, we calculate the surface density and luminosity function of our z_850dropouts as a function of intrinsic (accounting for magnification) magnitude.We find results consistent with published blank field surveys, despite usingmuch shallower data, and demonstrate the effectiveness of cluster surveys inthe search for z~7 galaxies.

Using the Bullet Cluster as a Gravitational Telescope to Study z~7 Lyman Break Galaxies