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N. Benitez (JHU), T.J. Broadhurst (Racah Inst. Physics, Hebrew U.), H. Ford, J.P Blakeslee (JHU), G.D. Illingworth (UCO/Lick Obs.), M. Postman (STScI), R. Bouwens (UCO/Lick Obs.), D. Coe, H.D. Tran, Z.I. Tsvetanov (JHU), R.L White (STScI), K. Zekser (JHU), I.D.T. ACS (JHU,STScI,Leiden Obs.)
A1689 is one of the most powerful gravitational lenses in the sky. In June 2002 we observed the center of A1689 with the ACS WFC for 20 orbits in the g,r,i,z bands, plus 3 orbits of grism observations. The resulting images are close to the depth of the HDFN over an area of 3.4'x3.4'. Combined with the magnification from the cluster, this offers an unprecedented view of the high redshift universe. The multicolor coverage, complemented with extensive ground based observations allows us to obtain reliable photo-z for a large fraction of the galaxies in the field. We have identified several multiple arc systems, and in some cases have confirmed their redshifts with grism observations. We present the spectacular images of A1689 and some preliminary results on the lensing analysis of this cluster. ACS was developed under NASA contract NAS 5-32865, and this research is supported by NASA grant NAG5-7697. We are grateful for an equipment grant from the Sun Microsystems, Inc.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.