Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8585p&link_type=abstract
HST Proposal ID #8585
Mathematics
Logic
Hst Proposal Id #8585 Cosmology
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. In Cycle 7 {and 7-NICMOS} we studied 12 SNe in the redshift range z 0.35-0.85; the forthcoming measurement of Omega and Lambda is expected to have uncertainty 11 embarked on a program to extend the redshifts to z 1.2, starting with 2 SNe. We here propose to continue the painstaking work of obtaining a statistically significant sample across this redshift range, by studying 2 more SNe at z 1.2, and filling in the redshift gap with 3 SNe between z 0.85-1.0. Measurement of these additional high redshift SNe will dramatically shrink the major-axis of the error ellipse in the Omega_M--Lambda plane, and unambiguously determine whether the universe contains a significant vacuum energy density. These data will provide powerful constraints on SN Ia evolution and on absorption by intergalactic ``gray'' dust; it would be very difficult for either evolution or dust to alter corrected peak magnitudes in the same way as cosmology predicts over the redshift range 0
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