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http://hdl.handle.net/2445/67862
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DC Field | Value | Language |
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dc.contributor.author | Perlmutter, Saul | - |
dc.contributor.author | Aldering, G. | - |
dc.contributor.author | Goldhaber, G. | - |
dc.contributor.author | Knop, R. A. | - |
dc.contributor.author | Nugent, P. | - |
dc.contributor.author | Castro, P. G. | - |
dc.contributor.author | Deustua, S. | - |
dc.contributor.author | Fabbro, S. | - |
dc.contributor.author | Goobar, A. | - |
dc.contributor.author | Groom, D. E. | - |
dc.contributor.author | Hook, I. M. | - |
dc.contributor.author | Kim, A. G. | - |
dc.contributor.author | Kim, M. Y. | - |
dc.contributor.author | Lee, J. C. | - |
dc.contributor.author | Nunes, N. J. | - |
dc.contributor.author | Pain, R. | - |
dc.contributor.author | Pennypacker, C. R. | - |
dc.contributor.author | Quimby, Robert | - |
dc.contributor.author | Lidman, C. | - |
dc.contributor.author | Ellis, R. S. | - |
dc.contributor.author | Irwin, M. | - |
dc.contributor.author | McMahon, R. G. | - |
dc.contributor.author | Ruiz Lapuente, Ma. Pilar | - |
dc.contributor.author | Walton, N. | - |
dc.contributor.author | Schaefer, B. | - |
dc.contributor.author | Boyle, B. J. | - |
dc.contributor.author | Filippenko, A. V. | - |
dc.contributor.author | Matheson, T. | - |
dc.contributor.author | Fruchter, A. S. | - |
dc.contributor.author | Panagia, N. | - |
dc.contributor.author | Newberg, H. J. M. | - |
dc.contributor.author | Couch, W. J. | - |
dc.date.accessioned | 2015-11-20T13:10:07Z | - |
dc.date.available | 2015-11-20T13:10:07Z | - |
dc.date.issued | 1998 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2445/67862 | - |
dc.description.abstract | We report measurements of the mass density, ΩM, and cosmological-constant energy density, ΩΛ, of the universe based on the analysis of 42 type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fitted jointly with a set of supernovae from the Calán/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. All supernova peak magnitudes are standardized using a SN Ia light-curve width-luminosity relation. The measurement yields a joint probability distribution of the cosmological parameters that is approximated by the relation 0.8ΩM-0.6ΩΛ≈-0.2±0.1 in the region of interest (ΩMlesssim1.5). For a flat (ΩM+ΩΛ=1) cosmology we find ΩMflat=0.28+0.09-0.08 (1 σ statistical) +0.05-0.04 (identified systematics). The data are strongly inconsistent with a Λ=0 flat cosmology, the simplest inflationary universe model. An open, Λ=0 cosmology also does not fit the data well: the data indicate that the cosmological constant is nonzero and positive, with a confidence of P(Λ>0)=99%, including the identified systematic uncertainties. The best-fit age of the universe relative to the Hubble time is t0flat=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 Calán/Tololo sample and our high-redshift sample. Excluding those few supernovae that are outliers in color excess or fit residual does not significantly change the results. The conclusions are also robust whether or not a width-luminosity relation is used to standardize the supernova peak magnitudes. We discuss and constrain, where possible, hypothetical alternatives to a cosmological constant. | - |
dc.format.extent | 22 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Institute of Physics (IOP) | - |
dc.relation.isformatof | Reproducció del document publicat a: http://dx.doi.org/10.1086/307221 | - |
dc.relation.ispartof | Astrophysical Journal, 1998, vol. 517, num. 2, p. 565-586 | - |
dc.relation.uri | http://dx.doi.org/10.1086/307221 | - |
dc.rights | (c) American Astronomical Society, 1998 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Cosmologia | - |
dc.subject.classification | Supernoves | - |
dc.subject.other | Cosmology | - |
dc.subject.other | Supernovae | - |
dc.title | Measurements of Omega and Lambda from 42 high-redshift supernovae | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 602304 | - |
dc.date.updated | 2015-11-20T13:10:07Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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602304.pdf | 1.73 MB | Adobe PDF | View/Open |
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