Observational Constraints on the Nature of Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
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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]
Collections | ANU Research Publications |
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Date published: | 2007 |
Type: | Journal article |
URI: | http://hdl.handle.net/1885/34973 |
Source: | Astrophysical Journal, The |
DOI: | 10.1086/518642 |
Access Rights: | Open Access |
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