Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-09
Prog.Theor.Phys. 106 (2001) 929-939
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, Accepted for publication in Prog. Theor. Phys. (Vol.106, No.5, 2001)
Scientific paper
10.1143/PTP.106.929
The data of type Ia supernovae observed by the High-z SN Search Team and Supernova Cosmology Project are analyzed in inhomogeneous cosmological models with a local void on scales of about 200 Mpc, to derive the best-fit values of model parameters and the confidence contours. The $\chi^2$ fitting is found to be slightly better than that in homogeneous models. It is shown that (1) the best-fit values are most sensitive to the ratio $R$ of the outer Hubble constant ($H_0^{\rm II}$) to the inner Hubble constant ($H_0^{\rm I}$), (2) the best-fit outer density parameter ($\Omega_0^{\rm II}$) (and cosmological constant parameter ($\lambda_0^{\rm II}$)) increases (and decreases) with the increase of $R$, respectively, and (3) $(\Omega_0^{\rm II}, \lambda_0^{\rm II})$ can be $(1, 0)$ for $R \approx 0.8$. Moreover it is shown that these models may be naturally consistent with the new supernova data (SN1997ff) for $z = 1.7$.
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