Hubble imaging excludes cosmic string lens

Eric Agol, Craig J. Hogan, Richard M. Plotkin
2006 Physical Review D  
The galaxy image pair CSL-1 has been a leading candidate for a cosmic string lens. High quality imaging data from the Hubble Space Telescope presented here show that it is not a lens but a pair of galaxies. The galaxies show different orientations of their principal axes, not consistent with any lens model. We present a new direct test of the straight-string lens model, using a displaced difference of the image from itself to exclude CSL-1 at high confidence.
doi:10.1103/physrevd.73.087302 fatcat:phtpbtv34vgyjo2jj5nfnzsmrm