All Figures

$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig1.ps}\end{figure}$ Figure 1: The HH 154 jet observed with HST in 1996 in the H $_{\rm\alpha }$ filter. The contours defining the knots within the jet and the nominal position of the IRS5 system are superimposed on the figure.
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In the text

$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig2.eps}\end{figure}$ Figure 2: HST image of the HH 154 jet in 1996 in both the H $_{\rm\alpha }$ ( left panel) and [SII] ( right panel) filters. The superimposed contours define the knots within the jet at different epochs: 1996 (blue), 1998 (green), and 2005 (red).
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{9347fig3.ps}\end{figure}$ Figure 3: R-band image of the HH 154 southern and northern jets in 1996.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{9347fig4.ps}\end{figure}$ Figure 4: Cut along the northern jet axis of the count image in the H $_{\rm\alpha }$ filter in 1996. The origin is located at the base of the jet, where the F₂ knot originates.
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In the text

$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig5.eps}\end{figure}$ Figure 5: Enlargement of the F-complex at the base of the HH 154 jet in 1996 in H $_{\rm\alpha }$ ( left panel) and [SII] ( right panel). Contours for the identification of knot F₂ ( on the left) and F ( on the right) in different epochs (1996 in blue, 1998 in green, and 2005 in red) are superimposed on this figure.
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In the text

$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig6.ps}\end{figure}$ Figure 6: The E knot in the 1996 observation in the H $_{\rm\alpha }$ filter with the contours that define the knot in 1996 (blue), 1998 (green), and 2005 (red). In 2005 this knot was disappearing or decomposing into several remnants.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig7.ps}\end{figure}$ Figure 7: Enlargement of the terminal working surface, knot D, at the head of the HH 154 jet in 1996 ( upper panels), 1998 ( middle panels), and 2005 ( lower panels) in H $_{\rm\alpha }$ , at two different contrast levels: high contrast ( on the left) to show the fainter features and low ( on the right) to show the brighter features.
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In the text

$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig8.ps}\end{figure}$ Figure 8: Enlargement of the D knot at the head of the jet: the motion of the brightest spot within the knot (blue vector) is measured in the reference system of the center of the D knot.
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{9347fig9.ps}\end{figure}$ Figure 9: Difference image H $_{\rm\alpha }$ - [SII] of HH 154 as observed with HST in 2005. The arrows indicate the dimension of the jet radius at its base and the separation between the center of the contour on the D knot in H $_{\rm\alpha }$ and in [SII], both equal to about 0.33''.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig10.ps}\end{figure}$ Figure 10: RGB image in the H $_{\rm\alpha }$ and [SII] filters of the HH 154 jet in the three epochs (1996 in blue, 1998 in green, and 2005 in red).
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In the text

$\begin{figure} \par\includegraphics[width=15.5cm,clip]{9347fig11.ps}\end{figure}$ Figure 11: H $_{\rm\alpha }$ image of HH 154 in 1996. The contours used to derive the proper motion of the knots within the jet are superimposed on the figure. The arrows show the distance traveled in two (blue) and in seven (red) years by each object, respectively, according to Table 3.
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In the text

$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig12.ps}\end{figure}$ Figure 12: Total length of the HH 154 jet in 1996 ( left panels), 1998 ( middle panels), and 2005 ( right panels) in H $_{\rm\alpha }$ ( upper panels) and [SII] ( lower panels).
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In the text

$\begin{figure} \par\includegraphics[width=14cm,clip]{9347fig13.ps}\end{figure}$ Figure 13: X-ray ( left panel) and H $_{\rm\alpha }$ ( right panel) emission as detected with Chandra and Hubble, respectively. The contours of the optical knots and of the X-ray emission are superimposed on the X-ray and optical images, respectively.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig1.ps}\end{figure}$	Figure 1: The HH 154 jet observed with HST in 1996 in the H $_{\rm\alpha }$ filter. The contours defining the knots within the jet and the nominal position of the IRS5 system are superimposed on the figure.
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$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig2.eps}\end{figure}$	Figure 2: HST image of the HH 154 jet in 1996 in both the H $_{\rm\alpha }$ ( left panel) and [SII] ( right panel) filters. The superimposed contours define the knots within the jet at different epochs: 1996 (blue), 1998 (green), and 2005 (red).
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$\begin{figure} \par\includegraphics[width=8.3cm,clip]{9347fig3.ps}\end{figure}$	Figure 3: R-band image of the HH 154 southern and northern jets in 1996.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{9347fig4.ps}\end{figure}$	Figure 4: Cut along the northern jet axis of the count image in the H $_{\rm\alpha }$ filter in 1996. The origin is located at the base of the jet, where the F₂ knot originates.
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$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig5.eps}\end{figure}$	Figure 5: Enlargement of the F-complex at the base of the HH 154 jet in 1996 in H $_{\rm\alpha }$ ( left panel) and [SII] ( right panel). Contours for the identification of knot F₂ ( on the left) and F ( on the right) in different epochs (1996 in blue, 1998 in green, and 2005 in red) are superimposed on this figure.
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$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig6.ps}\end{figure}$	Figure 6: The E knot in the 1996 observation in the H $_{\rm\alpha }$ filter with the contours that define the knot in 1996 (blue), 1998 (green), and 2005 (red). In 2005 this knot was disappearing or decomposing into several remnants.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig7.ps}\end{figure}$	Figure 7: Enlargement of the terminal working surface, knot D, at the head of the HH 154 jet in 1996 ( upper panels), 1998 ( middle panels), and 2005 ( lower panels) in H $_{\rm\alpha }$ , at two different contrast levels: high contrast ( on the left) to show the fainter features and low ( on the right) to show the brighter features.
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$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig8.ps}\end{figure}$	Figure 8: Enlargement of the D knot at the head of the jet: the motion of the brightest spot within the knot (blue vector) is measured in the reference system of the center of the D knot.
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$\begin{figure} \par\includegraphics[width=8.3cm,clip]{9347fig9.ps}\end{figure}$	Figure 9: Difference image H $_{\rm\alpha }$ - [SII] of HH 154 as observed with HST in 2005. The arrows indicate the dimension of the jet radius at its base and the separation between the center of the contour on the D knot in H $_{\rm\alpha }$ and in [SII], both equal to about 0.33''.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{9347fig10.ps}\end{figure}$	Figure 10: RGB image in the H $_{\rm\alpha }$ and [SII] filters of the HH 154 jet in the three epochs (1996 in blue, 1998 in green, and 2005 in red).
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$\begin{figure} \par\includegraphics[width=15.5cm,clip]{9347fig11.ps}\end{figure}$	Figure 11: H $_{\rm\alpha }$ image of HH 154 in 1996. The contours used to derive the proper motion of the knots within the jet are superimposed on the figure. The arrows show the distance traveled in two (blue) and in seven (red) years by each object, respectively, according to Table 3.
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$\begin{figure} \par\includegraphics[width=13.8cm,clip]{9347fig12.ps}\end{figure}$	Figure 12: Total length of the HH 154 jet in 1996 ( left panels), 1998 ( middle panels), and 2005 ( right panels) in H $_{\rm\alpha }$ ( upper panels) and [SII] ( lower panels).
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$\begin{figure} \par\includegraphics[width=14cm,clip]{9347fig13.ps}\end{figure}$	Figure 13: X-ray ( left panel) and H $_{\rm\alpha }$ ( right panel) emission as detected with Chandra and Hubble, respectively. The contours of the optical knots and of the X-ray emission are superimposed on the X-ray and optical images, respectively.
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