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

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

Submitted to Astrophys.J, 2007-09, Vol.666 (2), p.694-715 [Periódico revisado por pares]

Chicago, IL: IOP Publishing

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Título:
Observational Constraints on the Nature of Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
Autor: 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
Assuntos: ACOUSTICS ; Astronomi och astrofysik ; Astronomy ; Astronomy and astrophysics ; Astrophysics ; Astrophysics,ASTRO ; BARYONS ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COSMOLOGICAL CONSTANT ; cosmological parameters ; cosmology : observations ; Cosmology and Extra-Galactic Astrophysics ; DUSTS ; Earth, ocean, space ; Exact sciences and technology ; Fysik ; GALAXIES ; NATURAL SCIENCES ; NATURVETENSKAP ; OSCILLATIONS ; Physics ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Sciences of the Universe ; SUPERNOVAE ; supernovae : general ; UNIVERSE
É parte de: Submitted to Astrophys.J, 2007-09, Vol.666 (2), p.694-715
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
USDOE
AC02-76SF00515
SLAC-PUB-12281
Descrição: We present constraints on the dark energy equation-of-state parameter, w = P/(pc super(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 ( Omega sub(M), w) from baryon acoustic oscillations, we obtain a value for a static equation-of-state parameter w = -1.05 super(+) sub(-) super(0) sub(0) super(.) sub(.) super(1) sub(1) super(3) sub(2) (stat 1 sigma ) plus or minus 0.13 (sys) and Omega sub(M) = 0.274 super(+) sub(-) super(0) sub(0) super(.) sub(.) super(0) sub(0) super(3) sub(2) super(3) sub(0) (stat 1 sigma ) with a best-fit X super(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 super(+) sub(-) super(0) sub(0) super(.) sub(.) super(0) sub(0) super(9) sub(9) (stat 1 sigma ) plus or minus 0.13 (sys), Omega sub(M) = 0.267 super(+) sub(-) super(0) sub(0) super(.) sub(.) super(0) sub(0) super(2) sub(1) super(8) sub(8) (stat 1 sigma ) with a best-fit X super(2)/dof of 0.91. The current global SN Ia data alone rule out empty ( Omega sub(M) = 0), matter-only Omega sub(M) = 0.3, and Omega sub(M) = 1 universes at >4.5 sigma . The current SN Ia data are fully consistent with a cosmological constant.
Editor: Chicago, IL: IOP Publishing
Idioma: Inglês

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

Chicago, IL: IOP Publishing

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