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2003ApJ...594....1T
Cosmological Results from Highz 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 Highz 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
largescale 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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