A New High-z Galaxy Cluster with Extraordinary Lensed Arcs From Multiple Sources

Details A New High-z Galaxy Cluster with Extraordinary Lensed Arcs From Multiple Sources A New High-z Galaxy Cluster with Extraordinary Lensed Arcs From Multiple Sources

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9135g&link_type=abstract

HST Proposal ID #9135

Computer Science

Hst Proposal Id #9135 Cosmology

Scientific paper

In the course of the Red-Sequence Cluster Survey {a 100 deg^2 optical imaging survey}, we have discovered a stunning new example of strong lensing by a relatively high redshift {z 0.7} cluster. This lens system has more bright arcs, with better cluster azimuthal coverage than examples of lower z lenses previously imaged by HST {e.g., Abell 370, CL2244- 0221}, and is the only known lens at z>0.6 with such significant lensing. At least 4 separate arcs are detected in our initial survey data, at 3-4 different cluster-centric radii and hence likely corresponding to at least 3 different background sources at 3 different redshifts. Moreover, these arcs are relatively bright {R_c 21.5-24.2} and hence redshifts should be readily obtainable using 8m class telescopes. The proposed HST WFPC2 imaging, in conjunction with proposed VLT spectroscopy, offers an unprecedented opportunity to measure the core mass distribution of a cluster at such a high redshift. In combination with requested coordinated Chandra X- ray imaging, this will enable a direct comparison of the dark matter and baryonic components of the cluster, and enable a measure of cosmology via sources at different z. Furthermore, the arcs are bright enough to allow a detailed look at several high-z galaxies, via image reconstruction of the unlensed sources {only possible with HST images} and detailed spectroscopy.

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