{Measurements of Omega and Lambda from 42 High-Redshift Supernovae}


{Perlmutter} S, {Aldering} G, {Goldhaber} G, {Knop} R  A, {Nugent} P, {Castro} P  G, {Deustua} S, {Fabbro} S, {Goobar} A, {Groom} D  E, et al. {Measurements of Omega and Lambda from 42 High-Redshift Supernovae}. \apj. 1999;517 :565-586.

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{We report measurements of the mass density, Omega\_M, and cosmological-constant energy density, Omega\_Lambda, of the universe based on the analysis of 42 type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fitted jointly with a set of supernovae from the Calán/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. All supernova peak magnitudes are standardized using a SN Ia light-curve width-luminosity relation. The measurement yields a joint probability distribution of the cosmological parameters that is approximated by the relation 0.8Omega\_M-0.6Omega\_Lambda\~{}-0.2+/-0.1 in the region of interest (Omega\_Młt}\~{}1.5). For a flat (Omega\_M+Omega\_Lambda=1) cosmology we find Omega\^{}flat\_M=0.28\^{}+0.09\_-0.08 (1 sigma statistical) \^{}+0.05\_-0.04 (identified systematics). The data are strongly inconsistent with a Lambda=0 flat cosmology, the simplest inflationary universe model. An ope