All Figures

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0483fig1.ps}\end{figure}$ Figure 1: Continuum-subtracted H $\alpha$ image of NGC 1530.
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0483fig2.eps}\protect\end{figure}$ Figure 2: Representation of the position and luminosities of the catalogued H II regions of NGC 1530. The coordinates of the centre of the image are RA = $\hms 4h23m26.7s$ and Dec = 75d17m44s (J2000). The ionized regions around the nucleus of the galaxy have not been included in the catalogue, as their mutual proximity makes it difficult to delineate them accurately.
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In the text

$\begin{figure} \par\includegraphics[width=14cm,clip]{0483fig3.ps}\end{figure}$ Figure 3: Integrated line profiles for four H II regions of the three galaxies: NGC 1530, NGC 3359 and NGC 6951. The spectral resolutions in the line profiles are 18.6 km s^-1 for NGC 1530, and 15.6 km s^-1 for NGC 3359 and NGC 6951.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0483fig4a.ps}\vspace*{5mm} \par\includegraphics[width=8.8cm,clip]{0483fig4b.ps}\protect\end{figure}$ Figure 4: log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the H II regions in NGC 1530, NGC 3359, and NGC 6951. In a) the H $\alpha$ luminosity of the H II region is the luminosity given by the catalogue, while in b) the H $\alpha$ luminosity is the fraction of the H $\alpha$ luminosity from the catalogue corresponding to the fractional integrated intensity of the strongest Gaussian component in the H II region spectrum. $\rm\sigma _{nt}$ is the non-thermal velocity dispersion corresponding to the most intense central component.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0483fig5a.ps}\par\includegraphics[width=8.8cm,clip]{0483fig5b.ps}\protect\end{figure}$ Figure 5: log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the H II regions in NGC 1530, NGC 3359 and NGC 6951 and the corresponding points defining the best envelopes for each galaxy. Also shown is the representative linear fit to the envelope for each galaxy. The points marked with a cross represent the envelope when the H II regions of the three galaxies are considered as a single log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ distribution. a) the luminosity of the H II region is that obtained from the catalogue, b) the H $\alpha$ luminosity of the H II region is a fraction of the luminosity from the catalogue, corresponding to the most intense Gaussian peak in the emission line profile.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0483fig6.ps}\protect\end{figure}$ Figure 6: log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the three galaxies with H II regions having $\rm\sigma _{nt}>13$ km s^-1. The continous line represents the linear fit to the points on the envelope (bolder points in the diagram). The logarithmic H $\alpha$ luminosities are those in the photometric H II region catalogue.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0483fig7.ps}\protect\end{figure}$ Figure 7: log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the three galaxies with H II regions having $\rm\sigma _{nt}>13$ km s^-1 as in Fig. 6, but the logarithmic H $\alpha$ luminosities of the H II regions are found as a fraction of the logarithmic H $\alpha$ luminosity from the catalogue, as explained in text. The envelope fit is somewhat tighter than that in Fig. 6, but the slope is the same.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0483fig8a.ps}\vspace*{5mm}... ...space*{5mm} \includegraphics[width=8.2cm,clip]{0483fig8c.ps}\protect\end{figure}$ Figure 8: Plot of the H II regions at different deprojected galactocentric radii in the log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the three galaxies NGC 1530, NGC 3359 and NGC 6951, showing that radial effects (and hence by implication, metallicity effects) are not affecting systematically the log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ relation.
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In the text

$\begin{figure} \par\includegraphics[width=8.45cm,clip]{0483figA1.ps}\protect\end{figure}$ Figure A.1: Ratio of the measured luminosity for the H II regions of NGC 3359 using a cut-off isophote equal to half (stars) or 1/e (filled squares) of the peak intensity to the luminosity measured using a cut-off isophote equal to 3 times the rms noise plus the background level of the H $\alpha$ image.

In the text

$\begin{figure} \par\includegraphics[width=8.45cm,clip]{0483figA2.ps}\protect\end{figure}$ Figure A.2: Ratio of the measured luminosity for the H II regions of NGC 3359 using a cut-off isophote equal to 5 (stars) and 7 (filled squares) times the rms noise plus the background level of the H $\alpha$ image of the galaxy, to the luminosity measured using 3 times the rms noise plus the background level.

In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0483fig1.ps}\end{figure}$	Figure 1: Continuum-subtracted H $\alpha$ image of NGC 1530.
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$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0483fig2.eps}\protect\end{figure}$	Figure 2: Representation of the position and luminosities of the catalogued H II regions of NGC 1530. The coordinates of the centre of the image are RA = $\hms 4h23m26.7s$ and Dec = 75d17m44s (J2000). The ionized regions around the nucleus of the galaxy have not been included in the catalogue, as their mutual proximity makes it difficult to delineate them accurately.
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$\begin{figure} \par\includegraphics[width=14cm,clip]{0483fig3.ps}\end{figure}$	Figure 3: Integrated line profiles for four H II regions of the three galaxies: NGC 1530, NGC 3359 and NGC 6951. The spectral resolutions in the line profiles are 18.6 km s^-1 for NGC 1530, and 15.6 km s^-1 for NGC 3359 and NGC 6951.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0483fig6.ps}\protect\end{figure}$	Figure 6: log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ diagram for the three galaxies with H II regions having $\rm\sigma _{nt}>13$ km s^-1. The continous line represents the linear fit to the points on the envelope (bolder points in the diagram). The logarithmic H $\alpha$ luminosities are those in the photometric H II region catalogue.
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