New Constraints on $Ω_M$, $Ω_Λ$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST

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dc.creatorKnop, R. A.
dc.creatorAldering, G.
dc.creatorAmanullah, R.
dc.creatorAstier, P.
dc.creatorBlanc, G.
dc.creatorBurns, M. S.
dc.creatorConley, A.
dc.creatorDeustua, S. E.
dc.creatorDoi, M.
dc.creatorEllis, R.
dc.creatorFabbro, S.
dc.creatorFolatelli, G.
dc.creatorFruchter, A. S.
dc.creatorGaravini, G.
dc.creatorGarmond, S.
dc.creatorGarton, K.
dc.creatorGibbons, R.
dc.creatorGoldhaber, G.
dc.creatorGoobar, A.
dc.creatorGroom, D. E.
dc.creatorHardin, D.
dc.creatorHook, I.
dc.creatorHowell, D. A.
dc.creatorKim, A. G.
dc.creatorLee, B. C.
dc.creatorLidman, C.
dc.creatorMendez, J.
dc.creatorNobili, S.
dc.creatorNugent, P. E.
dc.creatorPain, R.
dc.creatorPanagia, N.
dc.creatorPennypacker, C. R.
dc.creatorPerlmutter, S.
dc.creatorQuimby, R.
dc.creatorRaux, J.
dc.creatorRegnault, N.
dc.creatorRuiz-Lapuente, P.
dc.creatorSainton, G.
dc.creatorSchaefer, B.
dc.creatorSchahmaneche, K.
dc.creatorSmith, E.
dc.creatorSpadafora, A. L.
dc.creatorStanishev, V.
dc.creatorSullivan, M.
dc.creatorWalton, N. A.
dc.creatorWang, L.
dc.creatorWood-Vasey, W. M.
dc.creatorYasuda, N.
dc.date2003-09-12
dc.date.accessioned2026-07-07T10:47:41Z
dc.date.available2026-07-07T10:47:41Z
dc.descriptionWe report measurements of $Ω_M$, $Ω_Λ$, and w from eleven supernovae at z=0.36-0.86 with high-quality lightcurves measured using WFPC-2 on the HST. This is an independent set of high-redshift supernovae that confirms previous supernova evidence for an accelerating Universe. Combined with earlier Supernova Cosmology Project data, the new supernovae yield a flat-universe measurement of the mass density $Ω_M=0.25^{+0.07}_{-0.06}$ (statistical) $\pm0.04$ (identified systematics), or equivalently, a cosmological constant of $Ω_Λ=0.75^{+0.06}_{-0.07}$ (statistical) $\pm0.04$ (identified systematics). When the supernova results are combined with independent flat-universe measurements of $Ω_M$ from CMB and galaxy redshift distortion data, they provide a measurement of $w=-1.05^{+0.15}_{-0.20}$ (statistical) $\pm0.09$ (identified systematic), if w is assumed to be constant in time. The new data offer greatly improved color measurements of the high-redshift supernovae, and hence improved host-galaxy extinction estimates. These extinction measurements show no anomalous negative E(B-V) at high redshift. The precision of the measurements is such that it is possible to perform a host-galaxy extinction correction directly for individual supernovae without any assumptions or priors on the parent E(B-V) distribution. Our cosmological fits using full extinction corrections confirm that dark energy is required with $P(Ω_Λ>0)>0.99$, a result consistent with previous and current supernova analyses which rely upon the identification of a low-extinction subset or prior assumptions concerning the intrinsic extinction distribution.
dc.descriptionAccepted for publication in Astrophysical Journal; For data tables and full-resolution figures, see http://supernova.lbl.gov
dc.identifierhttps://arxiv.org/abs/astro-ph/0309368
dc.identifierhttp://arxiv.org/abs/astro-ph/0309368
dc.identifierAstrophys.J.598:102,2003
dc.identifierdoi:10.1086/378560
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183620
dc.subjectAstrophysics
dc.titleNew Constraints on $Ω_M$, $Ω_Λ$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST
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