Measurement of Ω m, Ω Λ from an analysis of Type Ia supernovae with CMAGIC: Using color information to check the acceleration of the Universe

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We present measurements of Ω m and Ω Λ from a blind analysis of 24 high redshift Type Ia supernovae using a new technique (CMAGIC) for fitting multi-color lightcurves first introduced in Wang '03. CMAGIC takes advantage of the remarkably simple behavior of Type Ia supernovae on color-magnitude diagrams, and has several advantages over techniques based on maximum magnitudes. Among these are a substantially reduced sensitivity to host galaxy dust extinction independent of many assumptions about the nature of dust in other galaxies, a shallower luminosity-width relation, and the relative simplicity of the fitting procedure. This allows us to provide a powerful systematic cross check of previous supernova cosmology results, despite the fact that current data sets were not observed in a manner optimized for CMAGIC.

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