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Date and Time of the Query: 2019-05-26 T14:52:40 PDT
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For refcode 2003ApJ...594....1T:
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2003ApJ...594....1T Cosmological Results from High-z Supernovae John L. Tonry, Brian P. Schmidt, Brian Barris, Pablo Candia, Peter Challis, Alejandro Clocchiatti, Alison L. Coil, Alexei V. Filippenko, Peter Garnavich, Craig Hogan, Stephen T. Holland, Saurabh Jha, Robert P. Kirshner, Kevin Krisciunas, Bruno Leibundgut, Weidong Li, Thomas Matheson, Mark M. Phillips, Adam G. Riess, Robert Schommer, R. Chris Smith, Jesper Sollerman, Jason Spyromilio, Christopher W. Stubbs, and Nicholas B. Suntzeff Abstract. The High-z Supernova Search Team has discovered and observed eight new supernovae in the redshift interval z=0.3 -- 1.2. These independent observations, analyzed by similar but distinct methods, confirm the results of Riess and Perlmutter and coworkers that supernova luminosity distances imply an accelerating universe. More importantly, they extend the redshift range of consistently observed Type Ia supernovae (SNe Ia) to z~1, where the signature of cosmological effects has the opposite sign of some plausible systematic effects. Consequently, these measurements not only provide another quantitative confirmation of the importance of dark energy, but also constitute a powerful qualitative test for the cosmological origin of cosmic acceleration. We find a rate for SN Ia of (1.4+/-0.5)x10^-4^h^3^Mpc^-3^yr^-1^ at a mean redshift of 0.5. We present distances and host extinctions for 230 SN Ia. These place the following constraints on cosmological quantities: if the equation of state parameter of the dark energy is w=-1, then H_0_t_0_=0.96+/-0.04, and {OMEGA}_{LAMBDA}_-1.4{OMEGA}_M_=0.35+/-0.14. Including the constraint of a flat universe, we find {OMEGA}_M_=0.28+/-0.05, independent of any large-scale structure measurements. Adopting a prior based on the Two Degree Field (2dF) Redshift Survey constraint on {OMEGA}_M_ and assuming a flat universe, we find that the equation of state parameter of the dark energy lies in the range -1.48<w<-0.72 at 95% confidence. If we further assume that w>-1, we obtain w<-0.73 at 95% confidence. These constraints are similar in precision and in value to recent results reported using the WMAP satellite, also in combination with the 2dF Redshift Survey. Keywords: Cosmology: Cosmological Parameters, Cosmology: Observations, Cosmology: Distance Scale, Galaxies: Distances and Redshifts, Stars: Supernovae: General
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