AAS 205th Meeting, 9-13 January 2005
Session 123 Matter on the Largest Scales
Oral, Wednesday, January 12, 2005, 10:00-11:30am, Sunrise

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[123.02] Measurement of \Omegam, \Omega\Lambda from an analysis of Type Ia supernovae with CMAGIC: Using color information to check the acceleration of the Universe

A. Conley (UC Berkeley), Supernova Cosmology Project Collaboration

We present measurements of \Omegam and \Omega\Lambda 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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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.