All Figures

$\begin{figure} \par\includegraphics[width=17cm,clip]{0360fig1.eps} \end{figure}$ Figure 1: Structure of the RT unstable interface for different angular scales of the initial perturbation (logarithmic color-scale plot of the density) at t=10 t₀. The panels on the left refer to the case $\sigma =0$ ; those on the right to the case $\sigma =0.0025$ . Notice that in the magnetized case the efficiency of RT is maximum for angular scales of the initial perturbation between $\pi /12$ and $\pi /16$ .
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{0360fig2.eps} \end{figure}$ Figure 2: Same as in Fig. 1 but for higher values of the PWN magnetization. The panels on the left refer to the case $\sigma =0.005$ ; those on the right to the case $\sigma =0.01$ . Now the maximum growth rate for RT has moved to larger angular sizes $\sim$ $\pi /8$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{0360fig3.eps} \end{figure}$ Figure 3: Evolution of the ratio between the length of the finger (radial extent of the mixing layer in the turbulent HD case) and the radius of the PWN $R_{\rm cd}$ . The various curves refer to different initial perturbations: solid $\theta =\pi /6$ ; dotted $\theta =\pi /8$ ; dashed $\theta =\pi /12$ ; dot-dashed $\theta =\pi /16$ ; dash-triple-dot $\theta =\pi /24$ ; long-dashed $\theta =\pi /32$ . The upper panel refers to the case $\sigma =0$ ; the bottom panel to $\sigma =0.0025$ . After a superlinear phase, lasting for about 0.5 t₀for all values of $\theta$ , we observe a linear phase that for small $\theta$ in the HD regime last up to about $t\sim6~t_0$ , while in the MHD cases it stops earlier at around $t=~\sim$ 4 t₀. The growth of the finger saturates at later times for the smallest wavelengths. See text for a detailed description.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0360fig4.eps} \end{figure}$ Figure 4: Evolution of the ratio between the length of the finger and the radius of the PWN $R_{\rm cd}$ . The upper panel refers to $\theta =\pi /32$ ; the middle panel to $\theta =\pi /16$ ; the bottom one to $\theta =\pi /8$ . Different curves refer to different values of the wind magnetization: solid $\sigma =0$ ; dotted $\sigma =0.001$ ; dot-dashed $\sigma =0.0025$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{0360fig5.eps} \end{figure}$ Figure 5: Spatial Fourier transform of the column density $\eta$ in the region between the head of the finger and the shell of swept-up ejecta for the case $\sigma =0$ . The transform is taken at a time t=10 t₀ and the average has been subtracted. The different panels correspond to different angular sizes $\theta$ of the initial perturbation. The horizontal scale is in units of $1/\theta$ . Except for the case $\theta =\pi /6$ we observe a cascade to small scales associated with the formation of a narrow finger and structure associated to KH instability.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{0360fig6.eps} \end{figure}$ Figure 6: Same as Fig. 5 but for the case $\sigma =0.0025$ . We notice that now a bump appears in the power spectrum in most panels at around $1/10{-}1/20\ \theta$ . This is associated to the formation of a thick finger.
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{0360fig2.eps} \end{figure}$	Figure 2: Same as in Fig. 1 but for higher values of the PWN magnetization. The panels on the left refer to the case $\sigma =0.005$ ; those on the right to the case $\sigma =0.01$ . Now the maximum growth rate for RT has moved to larger angular sizes $\sim$ $\pi /8$ .
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0360fig4.eps} \end{figure}$	Figure 4: Evolution of the ratio between the length of the finger and the radius of the PWN $R_{\rm cd}$ . The upper panel refers to $\theta =\pi /32$ ; the middle panel to $\theta =\pi /16$ ; the bottom one to $\theta =\pi /8$ . Different curves refer to different values of the wind magnetization: solid $\sigma =0$ ; dotted $\sigma =0.001$ ; dot-dashed $\sigma =0.0025$ .
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$\begin{figure} \par\includegraphics[width=8.4cm,clip]{0360fig6.eps} \end{figure}$	Figure 6: Same as Fig. 5 but for the case $\sigma =0.0025$ . We notice that now a bump appears in the power spectrum in most panels at around $1/10{-}1/20\ \theta$ . This is associated to the formation of a thick finger.
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