Magnifying the High-z Universe with the Bullet Cluster 1E0657-56

Details Magnifying the High-z Universe with the Bullet Cluster 1E0657-56 Magnifying the High-z Universe with the Bullet Cluster 1E0657-56

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10863g&link_type=abstract

HST Proposal ID #10863. Cycle 15

Computer Science

Scientific paper

We propose to use the bullet cluster 1E0657-56 z=0.296 as a gravitational telescope to conduct a pencil beam survey of the galaxy population to z=7. The cluster 1E0657-56, one of the hottest and most X-ray luminous clusters known, is a highly efficient lens with critical curves comparable in size to Abell 1689. The proposed observations will yield a high-fidelity strong+weak lensing map of the cluster core, enabling identification of lensed, high-redshift sources and also providing a precision measurement of the cluster mass good to 5% within 350 kpc. The mass measurement will also serve as a key input for numerical simulations designed to reconstruct the dynamical history of the cluster merger and provide a new constraint on the dark matter self-interaction cross-section. In the cluster core the requested imaging will reach de-magnified magnitudes comparable to the Hubble Ultra Deep Field for lensed sources, but with 2+ magnitudes of magnification facilitating spectroscopic follow-up.

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