Cosmological Parameters Omega and Lambda from High-Redshift Type ia Supernovae

Details Cosmological Parameters Omega and Lambda from High-Redshift Type ia Supernovae Cosmological Parameters Omega and Lambda from High-Redshift Type ia Supernovae

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7336p&link_type=abstract

HST Proposal ID #7336

Mathematics

Logic

Hst Proposal Id #7336 Cosmology

Scientific paper

HST can make a direct measurement of the cosmological parameters, Omega, Lambda, and curvature {Omega_k} using Type Ia supernovae {SNe Ia} as calibrated ``standard candles.'' We propose to follow 12 high-redshift 0.5 < z < 0.9 SNe with HST, to produce a definitive set of high-redshift light curves, begining before maximum light, not obtainable from the ground. The SNe will be selected from a total of gs 50 SNe Ia discovered on the rising part of their light curves in two search runs at the CTIO-4m, during HST cycle 7 and cycle 7 NICMOS. We will follow eight SNe at z 0.9 with NICMOS in J {F110W} and with WFPC2 in I {F814W} and {at maximum} in R {F675W} and four SNe at z 0.5 with WFPC2 in R, and I. We will observe on five dates over the peak of each light curve, and once after the SN has faded. These data will determine the peak magnitude, colors, and decline rate for the 12 light curves. With the high-resolution imaging of NICMOS and WFPC2, the HST is uniquely capable of measuring SN light curves at z 0.9 in R, I and J. The final statistical error will be below the narrow dispersion, Sigma < 0.12 mag, of Type Ia SN peak magnitudes {calibrated by decline rate and color}, to yield measurements of Omega_M and Omega_Lambda with accuracy as good as Sigma 0.11.

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