Author | Conference | Journal | Organization | Year | DOI
Look for results that meet for the following criteria:
Academic
Publications
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant

Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant,10.1086/300499,Astronomical Journal,Adam G. Riess,Alex

Edit
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant   (Citations: 294)
BibTex | RIS | RefWorks Download
Adam G. Riess, Alexei V. Filippenko, Peter Challis, Alejandro Clocchiatti, Alan Diercks, Peter M. Garnavich, Ron L. Gilliland, Craig J. Hogan, Saurabh Jha, Robert P. Kirshner, B. Leibundgut, M. M. Phillipshttp://academic.research.microsoft.com/io.ashx?type=5&id=3476525&selfId1=0&selfId2=0&maxNumber=12&query=
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 <= z 0) and a current acceleration of the expansion (i.e., q_0 = 0, the spectroscopically confirmed SNe Ia are statistically consistent with q_0 0 at the 3.0 sigma and 4.0 sigma confidence levels, for two different fitting methods, respectively. Fixing a ``minimal'' mass density, Omega_M = 0.2, results in the weakest detection, Omega_Lambda > 0 at the 3.0 sigma confidence level from one of the two methods. For a flat universe prior (Omega_M + Omega_Lambda = 1), the spectroscopically confirmed SNe Ia require Omega_Lambda > 0 at 7 sigma and 9 sigma formal statistical significance for the two different fitting methods. A universe closed by ordinary matter (i.e., Omega_M = 1) is formally ruled out at the 7 sigma to 8 sigma confidence level for the two different fitting methods. We estimate the dynamical age of the universe to be 14.2 +/- 1.7 Gyr including systematic uncertainties in the current Cepheid distance scale. We estimate the likely effect of several sources of systematic error, including progenitor and metallicity evolution, extinction, sample selection bias, local perturbations in the expansion rate, gravitational lensing, and sample contamination. Presently, none of these effects appear to reconcile the data with Omega_Lambda = 0 and q_0 >= 0.
Journal: Astronomical Journal - ASTRON J , vol. 116, no. 3, pp. 1009-1038, 1998
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.
Sort by:

Citations (294)

Share this on