Observational constraints on the nature of dark energy: First cosmological results from the ESSENCE supernova survey

被引:725
作者
Wood-Vasey, W. M.
Miknaitis, G.
Stubbs, C. W.
Jha, S.
Riess, A. G.
Garnavich, P. M.
Kirshner, R. P.
Aguilera, C.
Becker, A. C.
Blackman, J. W.
Blondin, S.
Challis, P.
Clocchiatti, A.
Conley, A.
Covarrubias, R.
Davis, T. M.
Filippenko, A. V.
Foley, R. J.
Garg, A.
Hicken, M.
Krisciunas, K.
Leibundgut, B.
Li, W.
Matheson, T.
Miceli, A.
Narayan, G.
Pignata, G.
Prieto, J. L.
Rest, A.
Salvo, M. E.
Schmidt, B. P.
Smith, R. C.
Sollerman, J.
Spyromilio, J.
Tonry, J. L.
Suntzeff, N. B.
Zenteno, A.
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[4] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[5] Stanford Linear Accelerator Ctr, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA
[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[7] Johns Hopkins Univ, Baltimore, MD 21218 USA
[8] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
[9] Natl Opt Astron Observ, Cerro Tololo Inter Amer Observ, La Serena, Chile
[10] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[11] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[12] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago 22, Chile
[13] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada
[14] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark
[15] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
[16] European So Observ, D-85748 Garching, Germany
[17] Natl Opt Astron Observ, Tucson, AZ 85719 USA
[18] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[19] Stockholm Univ, Dept Astron, S-10691 Stockholm, Sweden
[20] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
关键词
cosmological parameters; cosmology : observations; supernovae : general;
D O I
10.1086/518642
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present constraints on the dark energy equation-of-state parameter, w = P/(rho c(2)), using 60 SNe Ia fromthe ESSENCE supernova survey. We derive a set of constraints on the nature of the dark energy assuming a flat universe. By including constraints on (Omega(M), w) from baryon acoustic oscillations, we obtain a value for a static equation-of-state parameter w = -1:05(-0.12)(+0: 13) (stat 1 sigma) +/- 0: 13 (sys) and Omega(M) = 0:274(-0.020)(+0:033) (stat 1 sigma) with a bestfit chi(2)/dof of 0.96. These results are consistent with those reported by the Supernova Legacy Survey from the first year of 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 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 first-results Supernova Legacy Survey SNe Ia, we obtain a joint constraint of w = -1:07(-0: 09)(+0:09) (stat 1 sigma) +/- 0: 13 ( sys), Omega(M) 0:267(-0:028)(+0:028) (stat 1 sigma) with a best-fit chi(2)/dof of 0.91. The current global SN Ia data alone rule out empty (Omega(M) = 0), matter-only Omega(M) = 0: 3, and Omega(M) = 1 universes at > 4.5 sigma. The current SN Ia data are fully consistent with a cosmological constant.
引用
收藏
页码:694 / 715
页数:22
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