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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/26548

Title: SUPERNOVA CONSTRAINTS AND SYSTEMATIC UNCERTAINTIES FROM THE FIRST THREE YEARS OF
Authors: Conley, Alex
& Supernova Legacy Survey
Keywords: cosmological parameters
cosmology: observations
supernovae: general
Issue Date: Jan-2011
Publisher: American Astronomical Society
Citation: The Astrophysical Journal Supplement Series, 192:1 (29pp), 2011 January
Abstract: We combine high-redshift Type Ia supernovae from the first three years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space Telescope). SN data alone require cosmic acceleration at >99.999% confidence, including systematic effects. For the dark energy equation of state parameter (assumed constant out to at least z = 1.4) in a flat universe, we find w = −0.91+0.16 −0.20 (stat)+0.07 −0.14 (sys) from SNe only, consistent with a cosmological constant. Our fits include a correction for the recently discovered relationship between hostgalaxy mass and SN absolute brightness. We pay particular attention to systematic uncertainties, characterizing them using a systematic covariance matrix that incorporates the redshift dependence of these effects, as well as the shape–luminosity and color–luminosity relationships. Unlike previous work, we include the effects of systematic terms on the empirical light-curve models. The total systematic uncertainty is dominated by calibration terms. We describe how the systematic uncertainties can be reduced with soon to be available improved nearby and intermediate-redshift samples, particularly those calibrated onto USNO/SDSS-like systems.
URI: http://hdl.handle.net/1807/26548
Appears in Collections:Supernova Legacy Survey

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