Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-06
Int.J.Mod.Phys. D13 (2004) 1661-1668
Astronomy and Astrophysics
Astrophysics
(1) Astrophysics Group, Cavendish Laboratory, Cambridge Unviersity, UK (2) Dipartimento di Fisica, Universita di Roma "La Sapi
Scientific paper
10.1142/S0218271804005092
Most cosmological parameter estimations are based on the same set of observations and are therefore not independent. Here, we test the consistency of parameter estimations using a combination of large-scale structure and supernovae data, without cosmic microwave background (CMB) data. We combine observations from the IRAS 1.2 Jy and Las Campanas redshift surveys, galaxy peculiar velocities and measurements of type Ia supernovae to obtain h=0.57_{-0.14}^{+0.15}, Omega_m=0.28+/-0.05 and sigma_8=0.87_{-0.05}^{+0.04} in agreement with the constraints from observations of the CMB anisotropies by the WMAP satellite. We also compare results from different subsets of data in order to investigate the effect of priors and residual errors in the data. We find that some parameters are consistently well constrained whereas others are consistently ill-determined, or even yield poorly consistent results, thereby illustrating the importance of priors and data contributions.
Hobson Mike
Lasenby Anthony
Melchiorri Alessandro
Odman Carolina
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