Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8346p&link_type=abstract
HST Proposal ID #8346
Mathematics
Logic
Hst Proposal Id #8346 Clusters Of Galaxies And Lensing
Scientific paper
HST can directly measure the cosmological parameters, Omega, Lambda, and thus the curvature, Omega_k, using Type Ia supernovae {SNe Ia} as calibrated standard candles. Observations of SNe Ia spanning a large redshift range are key to decoupling Omega and Lambda. For Cycle 7 and Cycle 7-NICMOS we proposed a measurement of Omega and Lambda with uncertainty 11 at z 0.5 and six at z 0.8 with WFPC and NICMOS; we have since embarked on this program and the results have more than met our expectations. We now propose to extend this successful project to study five additional SNe Ia between z 0.85 and z 1.2. Measurement of these additional high redshift SNe will dramatically shrink the major-axis of our current error ellipse in the Omega_M--Lambda plane, and unambiguously determine whether the universe contains a significant vacuum energy density as our current results strongly suggest. Results of these proposed observations will further give the first real limits on whether the universe is spatially flat. These data will test for evolution in the properties of SNe Ia since it should be difficult for evolution to alter corrected peak magnitudes with 15 the redshift range 0
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