Deep field weak lensing: testing (Lambda)CDM

Details Deep field weak lensing: testing (Lambda)CDM Deep field weak lensing: testing (Lambda)CDM

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..341t&link_type=abstract

NOAO Proposal ID #1999A-0341

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Scientific paper

We propose to observe weak gravitational lensing shear correlations as a function of source redshift. A deep 50 arcmin BTC mosaic forms a ``thick" pencil-beam probe, covering an adequate area at both low and high redshift. Different cosmologies predict significantly different dependences of shear on source redshift. This observation will test the competing flat universe models (Lambda)CDM, Hot-Cold DM, and SCDM. In the first case (suggested by recent SNIa observations) the universe is older and larger, giving rise to larger deflections and shear. Such a deep mass probe will pass through many large-scale filaments/walls/lumps of the kind expected from n-body CDM simulations. In addition to measuring the shear correlations induced by the large scale structure, mass maps made from inverting the 100,000 arclets will reveal some of these projected stuctures directly. Three color photometric redshifts enable a reliable low/high source redshift selection. Because these two fields will go fainter than any other planned observations, we propose to release the data to the community 12 months after acquisition.

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