Observational Constraints on the Nature of the Dark Energy [electronic resource] : First Cosmological Results From the ESSENCE Supernova Survey
- Published
- Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- 82 pages : digital, PDF file
- Additional Creators
- Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- We present constraints on the dark energy equation-of-state parameter, w = P/(ρc²), using 60 Type Ia supernovae (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{sub M}, w) from baryon acoustic oscillations, we obtain a value for a static equation-of-state parameter w = -1.05{sub -0.12}{sup +0.13} (stat 1σ) ± 0.13 (sys) and Ω{sub M} = 0.274{sub -0.020}{sup +0.033} (stat 1σ) with a best-fit χ²/DoF of 0.96. These results are consistent with those reported by the Super-Nova Legacy Survey in a similar program measuring supernova distances and redshifts. We evaluate sources of systematic error that afflict supernova observations and present Monte Carlo simulations that explore these effects. Currently, the largest systematic currently with the potential to affect our measurements is the treatment of extinction due to dust in the supernova host galaxies. Combining our set of ESSENCE SNe Ia with the SuperNova Legacy Survey SNe Ia, we obtain a joint constraint of w = -1.07{sub -0.09}{sup +0.09} (stat 1σ) ± 0.13 (sys), Ω{sub M} = 0.267{sub -0.018}{sup +0.028} (stat 1σ) with a best-fit χ²/DoF of 0.91. The current SNe Ia data are fully consistent with a cosmological constant.
- Report Numbers
- E 1.99:slac-pub-12281
slac-pub-12281 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
01/05/2007.
"slac-pub-12281"
"astro-ph/0701041"
Submitted to Astrophys.J. FT
Becker, A.C.; Davis, T.M.; Foley, R.J.; Stubbs, C.W.; Garg, A.; Jha, S.; Conley, A.; Aguilera, C.; Blackman, J.W.; Wood-Vasey, W.Michael; Filippenko, A.V.; Riess, A.G.; Kirshner, R.P.; Miknaitis, G.; Covarrubias, R.; Clocchiatti, A.; Garnavich, P.M.; Blondin, S.; Hicken, M.; Krisciunas, K.; Challis, P. - Funding Information
- AC02-76SF00515
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