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

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

2010-07-14

arxiv.org/abs/1007.2425v2

ApJ, 720, 1483 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted by ApJ A few minor wording changes for clarity in the figure captions

Scientific paper

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.

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