High-Z Supernova Search Team

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1 - Articles

Hubble Space Telescope and Ground-Based Observations of Type Ia Supernovae at Redshift 0.5: Cosmological Implications, A. Clocchiatti et al. (High Z SN Search), Astrophys. J. 642 (2006) 1-21, arXiv:astro-ph/0510155.
Type Ia Supernova Discoveries at z > 1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution, Adam G. Riess et al. (Supernova Search Team), Astrophys. J. 607 (2004) 665, arXiv:astro-ph/0402512.
From the abstract: We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to provide the first conclusive evidence for cosmic deceleration that preceded the current epoch of cosmic acceleration.
A purely kinematic interpretation of the SN Ia sample provides evidence at the $>99\%$ confidence level for a transition from deceleration to acceleration or similarly, strong evidence for a cosmic jerk. Using a simple model of the expansion history, the transition between the two epochs is constrained to be at $z=0.46 \pm 0.13$.
The data are consistent with the cosmic concordance model of $\Omega_M \approx 0.3, \Omega_\Lambda \approx 0.7$ ($\chi^2_{dof}=1.06$), and are inconsistent with a simple model of evolution or dust as an alternative to dark energy.
For a flat Universe with a cosmological constant, we measure $\Omega_M = 0.29 {}^{+0.05}_{-0.03}$ (equivalently, $\Omega_\Lambda=0.71$). When combined with external flat-Universe constraints including the cosmic microwave background and large-scale structure, we find $w = -1.02 {}^{+0.13}_{-0.19}$ (and $w<-0.76$ at the 95\% confidence level) for an assumed static equation of state of dark energy, $P = w\rho c^2$.
Our constraints are consistent with the static nature of and value of $w$ expected for a cosmological constant (i.e., $w_0 = -1.0$, $dw/dz = 0$), and are inconsistent with very rapid evolution of dark energy.

Cosmological Results from High-z Supernovae, John L. Tonry et al. (Supernova Search Team), Astrophys. J. 594 (2003) 1, arXiv:astro-ph/0305008.
From the abstract: The High-$ z$ Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval $ z=0.3-1.2$. These independent observations, analyzed by similar but distinct methods, confirm the result of Riess and others (1998a) and Perlmutter and others (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend the redshift range of consistently observed SN Ia to $ z\approx 1$, where the signature of cosmological effects has the opposite sign of some plausible systematic effects.... if the equation of state parameter of the dark energy is $ w=-1$, then $ H_0\,t_0 = 0.96\pm0.04$, and $ \Omega_\Lambda-1.4\Omega_M=0.35\pm0.14$. Including the constraint of a flat Universe, we find $ \Omega_M=0.28\pm0.05$, independent of any large-scale structure measurements. Adopting a prior based on the 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 $ -1.48-1$, we obtain $ w<-0.73$ at 95% confidence.
The Farthest Known Supernova: Support for an Accelerating Universe and a Glimpse of the Epoch of Deceleration, Adam G. Riess et al. (Supernova Search Team), Astrophys. J. 560 (2001) 49-71, arXiv:astro-ph/0104455.
Supernova Limits on the Cosmic Equation of State, Peter M. Garnavich et al. (Supernova Search Team), Astrophys. J. 509 (1998) 74-79, arXiv:astro-ph/9806396.
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant, Adam G. Riess et al. (Supernova Search Team), Astron. J. 116 (1998) 1009-1038, arXiv:astro-ph/9805201.

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