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$\begin{figure} \par\includegraphics[width=5.75cm,clip]{6632fig1a.eps}\hspace*{0.5cm} \includegraphics[width=5.75cm,clip]{6632fig1b.eps}\end{figure}$ Figure 1: Left: the age-redshift data points. a) Original data from GDDS. This sample corresponds to 20 old passive galaxies distributed over the redshift interval $1.308 \leq z \leq 2.147$ , as given by McCarthy et al. (2004). b) The 8 high-z measurements selected after the criterion discussed in the text. Right: LT relation as a function of the redshift for some values of the EoS parameter w and a fixed value of $\Omega _{\rm {m}} = 0.27$ . To plot these curves, we have used $\tau = 1.5$ Gyr. The thick line corresponds to the $\Lambda$ CDM case (w = -1).
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In the text

$\begin{figure} \par\includegraphics[height=7cm,width=7cm,clip]{6632fig2.eps}\end{figure}$ Figure 2: First results of our statistical analyses. GDDS LT constraints on the $\Omega _{\rm {m}}-w$ plane. The contours correspond to 68.3% and 95.4% confidence levels. The best-fit model for this analysis are $\Omega _{\rm {m}} = 0.21$ and w = -0.72.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=12cm,clip]{6632fig3.eps}\end{figure}$ Figure 3: Complementary results of our statistical analyses. a) GDDS LT plus SNLS constraints on the $\Omega _{\rm {m}}-w$ plane. The contours correspond to 68.3% and 95.4% confidence levels. The best-fit model for this analysis is $\Omega _{\rm {m}} = 0.28$ and w = -1.05 with $\chi ^2/\nu = 1.02$ . The dotted lines represent the constraints from BAO measurements. b) SNLS constraints on the parametric space $\Omega _{\rm {m}}-w$ shown here for the sake of comparison (see also Astier et al. 2006). c) The same as in Panel a) when GDDS LT data are combined with BAO measurements. d) Current constraints on the $\Omega _{\rm {m}}-w$ plane from SNLS + BAO data.
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In the text

$\begin{figure} \par\includegraphics[height=7cm,width=7cm,clip]{6632fig4.eps}\end{figure}$ Figure 4: Joint analysis involving GDDS LT + SNe Ia + BAO data. Note that, relative to the previous panels, the allowed parametric space is now considerably reduced. The best-fit values for all the analyses performed in this paper are presented in Table 1.
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In the text

$\begin{figure} \par\includegraphics[height=7cm,width=7cm,clip]{6632fig2.eps}\end{figure}$	Figure 2: First results of our statistical analyses. GDDS LT constraints on the $\Omega _{\rm {m}}-w$ plane. The contours correspond to 68.3% and 95.4% confidence levels. The best-fit model for this analysis are $\Omega _{\rm {m}} = 0.21$ and w = -0.72.
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$\begin{figure} \par\includegraphics[height=7cm,width=7cm,clip]{6632fig4.eps}\end{figure}$	Figure 4: Joint analysis involving GDDS LT + SNe Ia + BAO data. Note that, relative to the previous panels, the allowed parametric space is now considerably reduced. The best-fit values for all the analyses performed in this paper are presented in Table 1.
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