All Figures

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f1.eps}} \end{figure}$ Figure 1: Contour J-band image of the I Zw 1 host. The displayed contour levels are 21.16, 20.63, 20.38, 20.16, 19.97, 19.51, 18.83, 18.41, 17.88, 17.25, 16.64, and 14.65 mag arcsec^-2. The position of the tidal bridge and the tidal tail in the interaction zone is indicated.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f2.eps}} \end{figure}$ Figure 2: Comparison between the VLT/ISAAC J-band surface-brightness profile of I Zw 1, corrected for detector non-linearity, and earlier data from Peletier et al. (1999). Both profiles show a good agreement, even within the FWHM of the PSF ( $0\hbox{$.\!\!^{\prime\prime}$ }6$ ) of the ISAAC observations. The 3 $\sigma$ limiting surface brightness of the ISAAC profile is also shown.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f3.eps}} \end{figure}$ Figure 3: Comparison of the original J-band surface-brightness profile of the I Zw 1 host and the profile from which the QSO nucleus is subtracted.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f4.eps}} \end{figure}$ Figure 4: J-band surface-brightness profile of I Zw 1 calibrated in solar luminosities. An exponential disk component is fitted to emphasize the Freeman type I of the profile.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f5.eps}} \end{figure}$ Figure 5: Rotation curve of I Zw 1 corrected for a constant inclination of $38\hbox {$^\circ $ }$ . The inner slope of the ¹²CO(1-0) data from observations with the Plateau de Bure interferometer by Schinnerer et al. (1998), (filled squares), is compared with $0\hbox{$.\!\!^{\prime\prime}$ }7$ resolution BIMA observations by Staguhn et al. (2001), (dashed line). Towards larger radii, the curve is extended on the basis of H I data from VLA measurements by Lim & Ho (1999), (asterisks). The open square marks the velocity of a single giant molecular cloud complex on the south-eastern side of the I Zw 1 nucleus.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f6.eps}} \end{figure}$ Figure 6: Final model for the surface-brightness profile. The contributions of the Plummer bulge and the Kuzmin disk are also visualized. In order to resolve the bulge region better, radial distances are plotted logarithmically.
Open with DEXTER

In the text

$\begin{figure} \par\mbox{\subfigure[]{ \resizebox{8.6cm}{!} {\includegraphics[... ... \resizebox{8.6cm}{!} {\includegraphics[clip]{h4270f10.eps}} }} \end{figure}$ Figure 7: Four examples of a decomposition of the I Zw 1 gas rotation curve. The model curve (solid line) is shown together with the individual contributions of bulge (dotted line), disk (dashed line), and dark halo (dash-dot line). a) Fit with only a disk and a dark halo (disk only). b) Maximum-disk fit (max disk). c), d) All fitting parameters are unconstrained and fitted simultaneously. The left panel shows a case in which more weight is put on the steep increase at the inside of the rotation curve by confining the lower limit of the fitting region to $0\hbox{$.\!\!^{\prime\prime}$ }4$ (free a). In the right panel the fitting region starts at $0\hbox{$.\!\!^{\prime\prime}$ }6$ (free b). See text for a detailed description.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f11.eps}} \end{figure}$ Figure 8: Deviation of the X parameters of various disk solutions from the X parameter ( $X\approx 2$ ) at which amplification is most effective. The deviation is expressed as the quadratic deviation (X-2)² from X=2. The disk solutions are expressed in terms of their maximum circular velocities as a percentage of the maximum disk.
Open with DEXTER

In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f1.eps}} \end{figure}$	Figure 1: Contour J-band image of the I Zw 1 host. The displayed contour levels are 21.16, 20.63, 20.38, 20.16, 19.97, 19.51, 18.83, 18.41, 17.88, 17.25, 16.64, and 14.65 mag arcsec^-2. The position of the tidal bridge and the tidal tail in the interaction zone is indicated.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f2.eps}} \end{figure}$	Figure 2: Comparison between the VLT/ISAAC J-band surface-brightness profile of I Zw 1, corrected for detector non-linearity, and earlier data from Peletier et al. (1999). Both profiles show a good agreement, even within the FWHM of the PSF ( $0\hbox{$.\!\!^{\prime\prime}$ }6$ ) of the ISAAC observations. The 3 $\sigma$ limiting surface brightness of the ISAAC profile is also shown.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f3.eps}} \end{figure}$	Figure 3: Comparison of the original J-band surface-brightness profile of the I Zw 1 host and the profile from which the QSO nucleus is subtracted.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f4.eps}} \end{figure}$	Figure 4: J-band surface-brightness profile of I Zw 1 calibrated in solar luminosities. An exponential disk component is fitted to emphasize the Freeman type I of the profile.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f6.eps}} \end{figure}$	Figure 6: Final model for the surface-brightness profile. The contributions of the Plummer bulge and the Kuzmin disk are also visualized. In order to resolve the bulge region better, radial distances are plotted logarithmically.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics[clip]{h4270f11.eps}} \end{figure}$	Figure 8: Deviation of the X parameters of various disk solutions from the X parameter ( $X\approx 2$ ) at which amplification is most effective. The deviation is expressed as the quadratic deviation (X-2)² from X=2. The disk solutions are expressed in terms of their maximum circular velocities as a percentage of the maximum disk.
Open with DEXTER