17.3.2008 Marek Kowalski Moriond 2008 - Cosmology The “Union” Supernova Ia Compilation and new Cosmological Constraints Marek Kowalski Humboldt Universität.

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Presentation transcript:

Marek Kowalski Moriond Cosmology The “Union” Supernova Ia Compilation and new Cosmological Constraints Marek Kowalski Humboldt Universität zu Berlin for the Supernova Cosmology Project Moriond 2008

Marek Kowalski Moriond Cosmology The Union SNe Compilation    M fainter 8 new SNe

Marek Kowalski Moriond Cosmology Analysis aspects Consistent Lightcurve Fits SALT fitter used for all SNe using mostly original band-passes (Guy et al 2005/2007). Blind analysis The analysis (i.g. cuts) were developed on a blinded data set, all luminosities were offset by a hidden redshift-dependent amount. Robust analysis Initial cosmological fit using median statistics. 3-sigma outliers removed. Assignment of sample dependent dispersion. Stretch and color corrected luminosity: Large sample of SNe allows new studies of systematic errors

Marek Kowalski Moriond Cosmology A heterogenous data sample

Marek Kowalski Moriond Cosmology Study of - mean deviation - residual slope A heterogenous data sample

Marek Kowalski Moriond Cosmology Test for Tension high-z low-z mean deviation: OK

Marek Kowalski Moriond Cosmology Test for Tension high-z low-z residual slope: (OK)

Marek Kowalski Moriond Cosmology Testing SN evolution by subdividing the sample Evolution test: Redshift No significant evidence for evolution! Evolution test: Population

Marek Kowalski Moriond Cosmology Systematic errors Nuisance parameters for systematic errors: common for all z>0.2 SNe sample dependent

Marek Kowalski Moriond Cosmology Comparison with previous compilations Union Riess Gold Davis 2007 Union w/o New SCP SNe without the 8 new nearby SNe 184 SNe192 SNe307 SNe

Marek Kowalski Moriond Cosmology Perlmutter et al., 1999 Results: Cosmological fit parameters MM  MM Combination of SNe with: BAO (Eisenstein et. al., 2005) CMB (WMAP-5 year data, 2008) For a flat Universe: … and with curvature:

Marek Kowalski Moriond Cosmology Equation of state: w =p/  SNe + BAO + CMB... and allowing for curvature: With systematics

Marek Kowalski Moriond Cosmology Redshift dependent w w=w 0 + (1-a) w a w 0 + w a = 0

Marek Kowalski Moriond Cosmology Redshift dependent w Assuming step-wise constant w: A floating non-SNe bin to decouple low from high-redshift constraints

Marek Kowalski Moriond Cosmology Summary The Union SN compilation provides a consistently analyzed data set, and with new nearby SNe, is the largest available. Investigations of systematics show no significant tension between the individual samples as well as no evidence for SN evolution. The strongest constraints to date on the dark energy density and the equation of state parameter w, however, essentially no constraints at z>1. A detailed paper has been submitted to ApJ and the data will soon be made available on the web (see