The galaxy alignment effect in Abell 1689: evolution, radial and luminosity dependence
arXiv:1007.2425 · doi:10.1088/0004-637X/720/2/1483
Abstract
We measure alignments on scales of 1 Mpc $h^{-1}_{71}$ for galaxies in Abell 1689 ($z=0.18$) from an existing Hubble Space Telescope mosaic. We find evidence of galaxy alignment in the inner 500 $h^{-1}_{71}$ kpc. The alignment appears to be stronger towards the centre and is mostly present among the fainter galaxies, while bright galaxies are unaligned. This is consistent with a model where alignments originate from tidal locking.
Accepted by ApJ A few minor wording changes for clarity in the figure captions