Measurements of Omega and Lambda from 42 High-Redshift Supernovae

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dc.creatorPerlmutter, S.
dc.creatorAldering, G.
dc.creatorGoldhaber, G.
dc.creatorKnop, R. A.
dc.creatorNugent, P.
dc.creatorCastro, P. G.
dc.creatorDeustua, S.
dc.creatorFabbro, S.
dc.creatorGoobar, A.
dc.creatorGroom, D. E.
dc.creatorHook, I. M.
dc.creatorKim, A. G.
dc.creatorKim, M. Y.
dc.creatorLee, J. C.
dc.creatorNunes, N. J.
dc.creatorPain, R.
dc.creatorPennypacker, C. R.
dc.creatorQuimby, R.
dc.creatorLidman, C.
dc.creatorEllis, R. S.
dc.creatorIrwin, M.
dc.creatorMcMahon, R. G.
dc.creatorRuiz-Lapuente, P.
dc.creatorWalton, N.
dc.creatorSchaefer, B.
dc.creatorBoyle, B. J.
dc.creatorFilippenko, A. V.
dc.creatorMatheson, T.
dc.creatorFruchter, A. S.
dc.creatorPanagia, N.
dc.creatorNewberg, H. J. M.
dc.creatorCouch, W. J.
dc.date1998-12-08
dc.date.accessioned2026-07-07T12:01:09Z
dc.date.available2026-07-07T12:01:09Z
dc.descriptionWe report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these SNe, at redshifts between 0.18 and 0.83, are fit jointly with a set of SNe from the Calan/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. All SN peak magnitudes are standardized using a SN Ia lightcurve width-luminosity relation. The measurement yields a joint probability distribution of the cosmological parameters that is approximated by the relation 0.8 Omega_M - 0.6 Omega_Lambda ~= -0.2 +/- 0.1 in the region of interest (Omega_M <~ 1.5). For a flat (Omega_M + Omega_Lambda = 1) cosmology we find Omega_M = 0.28{+0.09,-0.08} (1 sigma statistical) {+0.05,-0.04} (identified systematics). The data are strongly inconsistent with a Lambda = 0 flat cosmology, the simplest inflationary universe model. An open, Lambda = 0 cosmology also does not fit the data well: the data indicate that the cosmological constant is non-zero and positive, with a confidence of P(Lambda > 0) = 99%, including the identified systematic uncertainties. The best-fit age of the universe relative to the Hubble time is t_0 = 14.9{+1.4,-1.1} (0.63/h) Gyr for a flat cosmology. The size of our sample allows us to perform a variety of statistical tests to check for possible systematic errors and biases. We find no significant differences in either the host reddening distribution or Malmquist bias between the low-redshift Calan/Tololo sample and our high-redshift sample. The conclusions are robust whether or not a width-luminosity relation is used to standardize the SN peak magnitudes.
dc.description21 pages and 10 figures. Accepted for publication in the Astrophysical Journal. Individual color figures, supplementary tables, and preprint also available at http://www-supernova.lbl.gov/
dc.identifierhttps://arxiv.org/abs/astro-ph/9812133
dc.identifierhttp://arxiv.org/abs/astro-ph/9812133
dc.identifierAstrophys.J.517:565-586,1999
dc.identifierdoi:10.1086/307221
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207007
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMeasurements of Omega and Lambda from 42 High-Redshift Supernovae
dc.typetext

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