Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-14
Astronomy and Astrophysics
Astrophysics
To appear in Proceedings of IAU Symposium 225: Impact of Gravitational Lensing on Cosmology, 6 pages
Scientific paper
10.1017/S174392130500195X
ACS observations of massive lensing clusters permit an order of magnitude increase in the numbers of multiply-lensed background galaxies identified behind a given cluster. We have developed a code to take the pixels belonging to any given image and generate counter-images with full resolution, so that multiple systems are convincingly and exhaustively identified. Over 130 images of 35 multiply lensed galaxies are found behind A1689, including many radial arcs and also tiny counter-images projected on the center of mass. The derived mass profile is found to flatten steadily towards the center, like an NFW profile, with a mean slope d(log(Sigma))/d(log(r)) ~ -0.55 +/- 0.1, over the range r<250 kpc/h, which is somewhat steeper than predicted for such a massive halo. We also clearly see the expected geometric increase of bend angles with redshift, however, given the low redshift of A1689, z=0.18, the dependence on cosmological parameters is weak, but using higher redshift clusters from our GTO program we may derive a more competitive constraint.
ACS Science Team
Benítez Narciso
Broadhurst Tom J.
Coe Dan
Ford Holland
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