NICMOS observations of A1689

Details NICMOS observations of A1689 NICMOS observations of A1689

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10150b&link_type=abstract

HST Proposal ID #10150

Physics

Optics

Hst Proposal Id #10150 Cosmology

Scientific paper

The potential of galaxy clusters as ``cosmic telescopes'' has been known for a long time, but practical results in the pre-ACS era have been scarce due to two main problems: the uncertainty in determining the magnification distribution of the cluster {the ``optics'' of the instrument} and the presence of numerous bright cluster galaxies which cover the field of view and hinder the detection of background galaxies. We have developed techniques to solve these two problems working with our ACS observations of A1689, the most powerful lens in the sky, and for the first time we have been able to determine the "specifications" of a cosmic telescope with a useful level of precision, thanks to the detection and identification of more than 100 multiple images with reliable redshift information. We propose to observe the high magnification region in the A1689 field in the F110W band with a 3x3 mosaic of NIC3 pointings; the resulting image will reach a lens-corrected limiting magnitudes of 29.5 for point sources, surpassing in depth the UDF NICMOS observations and providing an unique dataset with multiple scientific returns.

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