The Advanced Camera Galaxy Redshift Survey

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

New deep HST Advanced Camera for Surveys (ACS) images are revolutionizing the field of strong lensing by providing record numbers of multiply-imaged galaxies, from zero to 30 behind the most well-studied and most massive cluster A1689, enabling strong constraints on the underlying total mass. With the ultradeep imaging of our key targets, photometric redshifts provide a useful and fast means of obtaining redshifts, but spectroscopic redshifts are found to be necessary for identification of the highest-z galaxies in the sample. We present the catalog of ground-based redshifts toward the massive lensing cluster Abell 1689. We have obtained 98 robust redshifts of new objects. These objects show evidence for cluster magnification compared to the field. Eight new high-z galaxies are presented, z>3, including the third brightest Lyman-break galaxy known, and bright enough for high resolution follow-up work. The multiply-imaged high-z background galaxies are used to construct the 2d model deflection field, which yields a total mass profile that does not have a core but flattens toward the center, consistent with cold dark matter simulations (Broadhurst, et al. 2005).

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