Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-17
Astrophys.J.695:1446-1456,2009
Astronomy and Astrophysics
Astrophysics
11 pages, 6 figures, submitted to ApJ; replaced with version accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/695/2/1446
We measure the ellipticity of isolated clusters of galaxies in the Sloan Digital Sky Survey (SDSS) using gravitational lensing. We stack the clusters, rotating so that the major axes of the ellipses determined by the positions of cluster member galaxies are aligned. We exclude the signal from the central 0.5 h^-1 Mpc to avoid problems with stacking alignment and cluster member contamination. We fit an elliptical NFW profile and find an axis ratio for the dark matter of f = b/a = 0.48+0.14-0.09 (1 sigma), and rule out f=1 at 99.6 per cent confidence thus ruling out a spherical halo. We find that the ellipticity of the cluster galaxy distribution is consistent with being equal to the dark matter ellipticity. The results are similar if we change the isolation criterion by 50 per cent in either direction.
Bridle Sarah
Dalland Evans Anna Kathinka
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