Measurements of Ω and Λ from 42 High‐Redshift Supernovae
| Autor: | S. Perlmutter, G. Aldering, G. Goldhaber, R. A. Knop, P. Nugent, P. G. Castro, S. Deustua, S. Fabbro, A. Goobar, D. E. Groom, I. M. Hook, A. G. Kim, M. Y. Kim, J. C. Lee, N. J. Nunes, R. Pain, C. R. Pennypacker, R. Quimby, C. Lidman, R. S. Ellis, M. Irwin, R. G. McMahon, P. Ruiz‐Lapuente, N. Walton, B. Schaefer, B. J. Boyle, A. V. Filippenko, T. Matheson, A. S. Fruchter, N. Panagia, H. J. M. Newberg, W. J. Couch, The Supernova Cosmology Project |
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| Rok vydání: | 1999 |
| Předmět: |
Physics
Age of the universe Angular diameter distance Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Omega Redshift symbols.namesake Supernova 13. Climate action Space and Planetary Science symbols Astrophysics::Solar and Stellar Astrophysics Baryon acoustic oscillations Supernova Legacy Survey Astrophysics::Galaxy Astrophysics Hubble's law |
| Zdroj: | The Astrophysical Journal. 517:565-586 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/307221 |
| Popis: | We 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 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. |
| Databáze: | OpenAIRE |
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