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We measure alignments on scales of 1 Mpc $h^{-1}_{71}$ for galaxies in Abell1689 ($z=0.18$) from an existing Hubble Space Telescope mosaic. We findevidence of galaxy alignment in the inner 500 $h^{-1}_{71}$ kpc. The alignmentappears to be stronger towards the centre and is mostly present among thefainter galaxies, while bright galaxies are unaligned. This is consistent witha model where alignments originate from tidal locking.

The galaxy alignment effect in Abell 1689: evolution, radial and luminosity dependence