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Observational Constraints on the Nature of Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey

Wood-Vasey, W. Michael; Miknaitis, Gajus; Stubbs, Christopher; Jha, Saurabh; Riess, Adam; Garnavich, Peter M; Kirshner, Robert P; Aguilera, Claudio; Becker, Andrew C; Blackman, Joshua; Blondin, Stephanie; Challis, Peter M; Clocchiatti, Alejandro; Conley, A; Covarrubias, Ricardo; Davis, T M; Filippenko, Alexei; Foley, Ryan; Garg, Armin; Hicken, Malcolm; Krisciunas, Kevin; Leibundgut, Bruno; Li, W; Matheson, Thomas; Miceli, Anthony; Narayan, Gautham; Pignata, Guiliano; Prieto, Jose Luis; Rest, Armin; Salvo, Maria; Schmidt, Brian; Smith, R. Chris; Sollerman, Jesper; Spyromilio, Jason; Tonry, John; Suntzeff, Nicholas B; Zenteno, Alfredo; Schmidt, Brian

Description

We present constraints on the dark energy equation-of-state parameter, w = P/(pc 2), using 60 SNe Ia from the ESSENCE supernova survey. We derive a set of constraints on the nature of the dark energy assuming a flat universe. By including constraints on (Ω M, w) from baryon acoustic oscillations, we obtain a value for a static equation-of-state parameter w = -1.05 +0.13-0.12 (stat 1 σ)±0.13 (sys) and Ω M= 0.274 -0.020+0.033 (stat 1σ ) with a bestfit x 2/dof of 0.96. These results are consistent...[Show more]

CollectionsANU Research Publications
Date published: 2007
Type: Journal article
URI: http://hdl.handle.net/1885/34973
Source: Astrophysical Journal, The
DOI: 10.1086/518642

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