SDSS SN Hubble Diagram: First Cosmology Results

Mathematics – Logic

Scientific paper

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Scientific paper

The SDSS Supernova Survey has revealed a 129 spectroscopically confirmed SNe of Type Ia in 2005 the first year of its regular operation. These SNe in the redshift range between 0.05 and 0.4 populate a yet only sparsely sampled region of the Hubble diagram and therefore connecting the available nearby SNe data to observations carried out at higher redshifts. For a large fraction of these SNe multi filter light curves in many cases starting well before maximum were obtained. This allows to calculate robust estimates of the luminosity distance by using well established techniques to reduce the intrinsic scatter in absolute SNe brightness and thus to measure the expansion history of the universe in the above mentioned redshift interval. We will present results on cosmological parameters derived from the SDSS SN data alone and in combination with other SNe surveys and also in combination with independent cosmological probes like baryon acoustic oscillations or the WMAP results.

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