All Figures

$\begin{figure} \par\includegraphics[width=11.6cm,clip]{0353fig1.eps} \end{figure}$ Figure 1: The historic optical light curve of OQ 530, derived from archive data (open circles, Miller 1978) corrected according Nesci & Massaro (1999), and updated with other measurements from the Asiago archive and from our monitoring program (filled circles).
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In the text

$\begin{figure} \par\includegraphics[width=10cm,clip]{0353fig2.eps} \end{figure}$ Figure 2: Upper panel: the optical light curve in the R (Cousins) band of OQ 530 from 1994 to 2001. Central panel: light curves of OQ 530 at several radio and submilliteric frequencies; data at 22 GHz to May 1995 (solid circles) are taken from (Teräsranta et al. 1998) and those from 1996 to 1997 (asterisks) from (Venturi et al. 2001); data at 8.4 GHz (1996-2000, crosses) are also from (Venturi et al. 2001) and those at 353 GHz (open circles) are from (Robson et al. 2001). Lower panel: time history of the core (filled squares) and the jet (open squares) flux density at 5 GHz of OQ 530 derived from literature and from our observations. The two vertical solid (grey) lines indicate the epoch of our VLBI observations at 5 GHz (1999, Feb. 20 and 2001, June 5).
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0353fig3.ps} \end{figure}$ Figure 3: The EVN image of OQ530 at 5 GHz (February 20, 1999). The contour levels are -1, 1, 2, 4, 8, 16, 32, 64 128 mJy. The peak flux density is 233.1 mJy beam^-1. The beam is $4\times 2$ mas² at PA 0 $^\circ$ .
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In the text

$\begin{figure} \par\includegraphics[height=7.1cm,width=8.2cm,clip]{0353fig4.ps} \end{figure}$ Figure 4: The EVN image of OQ530 at 5 GHz (June 05, 2001). The contour levels are -2, 2, 4, 8, 16, 32, 64 128, 256 512 mJy. The peak flux density is 712.0 mJy beam^-1. The beam is $4\times 2$ mas² at PA 0 $^\circ$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0353fig5.ps} \end{figure}$ Figure 5: The EVN image of OQ530 at 1.67 GHz (June 08, 1998). The contour levels are -1.5, 1.5, 2.5, 4, 8, 16, 32, 64 128, 256 mJy. The peak flux density is 363.6 mJy beam^-1. The beam is $5.8\times 4.6$ mas² at PA 14 $^\circ$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0353fig6.ps} \end{figure}$ Figure 6: The flux density profiles along the jet of OQ 530 at the frequency of 5 GHz. The flux scale is logarithmic to view better the low brightness features. The vertical lines indicate the positions of the components given by the modelfittings in Table 2.
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In the text

$\begin{figure} \par\includegraphics[height=8.8cm,width=8.6cm,clip]{0353fig7.ps} \end{figure}$ Figure 7: Two possible SEDs of synchrotron core emission of OQ 530 covering the radio to X-ray range. Optical data are from our database. Open square is the flux at 0.5 keV measured by BeppoSAX in March 2000. Dashed lines are the SED modeled using the law of Eq. (2).
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In the text

$\begin{figure} \par\includegraphics[width=11.6cm,clip]{0353fig1.eps} \end{figure}$	Figure 1: The historic optical light curve of OQ 530, derived from archive data (open circles, Miller 1978) corrected according Nesci & Massaro (1999), and updated with other measurements from the Asiago archive and from our monitoring program (filled circles).
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0353fig3.ps} \end{figure}$	Figure 3: The EVN image of OQ530 at 5 GHz (February 20, 1999). The contour levels are -1, 1, 2, 4, 8, 16, 32, 64 128 mJy. The peak flux density is 233.1 mJy beam^-1. The beam is $4\times 2$ mas² at PA 0 $^\circ$ .
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$\begin{figure} \par\includegraphics[height=7.1cm,width=8.2cm,clip]{0353fig4.ps} \end{figure}$	Figure 4: The EVN image of OQ530 at 5 GHz (June 05, 2001). The contour levels are -2, 2, 4, 8, 16, 32, 64 128, 256 512 mJy. The peak flux density is 712.0 mJy beam^-1. The beam is $4\times 2$ mas² at PA 0 $^\circ$ .
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0353fig5.ps} \end{figure}$	Figure 5: The EVN image of OQ530 at 1.67 GHz (June 08, 1998). The contour levels are -1.5, 1.5, 2.5, 4, 8, 16, 32, 64 128, 256 mJy. The peak flux density is 363.6 mJy beam^-1. The beam is $5.8\times 4.6$ mas² at PA 14 $^\circ$ .
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0353fig6.ps} \end{figure}$	Figure 6: The flux density profiles along the jet of OQ 530 at the frequency of 5 GHz. The flux scale is logarithmic to view better the low brightness features. The vertical lines indicate the positions of the components given by the modelfittings in Table 2.
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$\begin{figure} \par\includegraphics[height=8.8cm,width=8.6cm,clip]{0353fig7.ps} \end{figure}$	Figure 7: Two possible SEDs of synchrotron core emission of OQ 530 covering the radio to X-ray range. Optical data are from our database. Open square is the flux at 0.5 keV measured by BeppoSAX in March 2000. Dashed lines are the SED modeled using the law of Eq. (2).
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