All Figures

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad(a) \qquad\qquad\qquad\qq... ...quad\qquad\qquad\qquad(c) \qquad\qquad\qquad\qquad\qquad\qquad (d)} \end{figure}$ Figure 1: A two step methodology is required to detect and restore faint features close to bright ones with wavelets. All images are 1.75' $\times$ 1.75'in the R band. a) Original image with objects of different shapes and surface brightnesses partly superimposed on the halo of a very bright star in the neighborhood; b) image restored from a thresholded wavelet transform selecting coefficients in the scale range 2⁰-2⁹ pixels in radius with an absolute value larger than 3 times the rms scatter expected for pure noise - some faint features have been missed; c) image obtained by subtracting the denoised image from the original one, showing the faint features at various scales which have been missed at the first step as well as some annular restoration artefacts due to local saturation effects; d) denoised image of the residual image computed from the subset of its wavelet coefficients in the scale range 2⁰-2⁷ pixels found significant with respect to the same thresholds as in the first step.
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In the text

$\begin{figure} \par\mbox{ \psfig{figure=1322f2a.ps,width=4.2cm,angle=0,clip=true... ...quad\qquad\qquad\qquad(a) \qquad\qquad\qquad\qquad\qquad\qquad (b)} \end{figure}$ Figure 2: Final products of the multiscale image processing involved when removing in a non-parametric way objects within a given scale range from an image. Images are 1.75' $\times$ 1.75' in the R band. a) Denoised image of the whole set of small scale structures in the original image as obtained by adding together the two images restored from the significant wavelet coefficients of the raw and residual images; b) difference between the original image and the image of the objects, showing that, except from a few annular artefacts due to local saturation, only noise and very large scale components are present in this second residual image.
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322so17.ps}\par\includegraphics[width=7.65cm,clip]{1322sd17.ps}\end{figure}$ Figure 3: Southern mosaic in the R band. Upper figure: reconstructed image of objects computed with the scale combination 10-7. Lower figure: residual image computed with the scale combination 10-7. We clearly see strong diffuse light emission towards the top of the lower image. The hemispheric structure corresponding to the light scattered by the instrument is visible in the bottom part of the lower image. North is up and East is left.
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322nd17.ps}\end{figure}$ Figure 4: Residual image of Northern mosaic computed with the scale combination 10-7 in the R band. In the bottom part of the image we clearly see diffuse emission in the region of galaxies NGC 4874 and 4889. Just above this diffuse emission, we can see the halo corresponding to the light of the bright star scattered by the instrument. The rectangle at the upper right was not considered because it contained two bright stars. North is up and East is left.
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322d18.ps}\end{figure}$ Figure 5: R band residual image of the area containing the two dominant galaxies computed with the 10-8 scale combination. Additional locations are shown: dynamical center of the NGC 4874 group from Gurzadyan & Mazure (2001)(cross), faint galaxy center from Biviano et al. (1996)(square) and global X-ray center (open circle). Black-shaded areas show the diffuse light emission maximum (source 1). The two filled circles are the positions of the two cluster dominant galaxies. The image size is 14 $\times$ 14 arcmin², as in the three following figures.
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322d17.ps}\end{figure}$ Figure 6: R band residual image of the area containing the two dominant galaxies computed with the 10-7 scale combination. Additional locations are shown as in Fig. 5, together with the secondary X-ray peak from Finoguenov (2004, private communication)(right filled circle). Black-shaded areas show the diffuse light emission maxima, with sources 2 ( left) and 3 ( right).
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322o16.ps}\par\includegraphics[width=7.65cm,clip]{1322d16.ps}\end{figure}$ Figure 7: R band images. Upper figure: object image of the area containing the two dominant galaxies computed with the 10-6 scale combination. Lower figure: residual image of the area containing the two dominant galaxies computed with the 10-6 scale combination. Additional locations are shown as in Figs. 5 and 6. The two view directions of Fig. 8 are indicated. Black shaded areas show the diffuse light emission maxima, with source 4 north of NGC 4874. The secondary X-ray peak from Finoguenov (2004, private communication) is shown as the open circle on the right.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=7.35cm,clip]{13222116.ps}\par\includegraphics[angle=270,width=7.65cm,clip]{13222216.ps}\end{figure}$ Figure 8: R band images. Upper figure: view 1 of residual image (10-6 combination scale) in Fig. 7. Lower figure: view 2 of residual image (10-6 combination scale) in Fig. 7. Angles of view are shown in Fig. 7. Additional locations of our sources and of NGC 4889 are shown.
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In the text

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$ Figure 9: Source 1 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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In the text

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$ Figure 10: Source 2 in the R band for 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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In the text

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$ Figure 11: Source 3 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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In the text

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$ Figure 12: Source 4 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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In the text

$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$ Figure 13: S/N maps for the 10-6 ( upper left), 10-7 ( upper right) and 10-8 ( low center) scale combinations. Overlaid contours are for the 4-5 $\sigma$ levels ( upper left), 3.5-4 $\sigma$ levels ( upper right) and 3-3.5 $\sigma$ levels ( low center).
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In the text

$\begin{figure} \par\includegraphics[width=7.65cm,clip]{1322d17.ps}\end{figure}$	Figure 6: R band residual image of the area containing the two dominant galaxies computed with the 10-7 scale combination. Additional locations are shown as in Fig. 5, together with the secondary X-ray peak from Finoguenov (2004, private communication)(right filled circle). Black-shaded areas show the diffuse light emission maxima, with sources 2 ( left) and 3 ( right).
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$\begin{figure} \par\includegraphics[angle=270,width=7.35cm,clip]{13222116.ps}\par\includegraphics[angle=270,width=7.65cm,clip]{13222216.ps}\end{figure}$	Figure 8: R band images. Upper figure: view 1 of residual image (10-6 combination scale) in Fig. 7. Lower figure: view 2 of residual image (10-6 combination scale) in Fig. 7. Angles of view are shown in Fig. 7. Additional locations of our sources and of NGC 4889 are shown.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 9: Source 1 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 10: Source 2 in the R band for 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 11: Source 3 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 12: Source 4 in the R band for the 10-6 (a), 10-7 (b) and 10-8 (c) combination scales.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 13: S/N maps for the 10-6 ( upper left), 10-7 ( upper right) and 10-8 ( low center) scale combinations. Overlaid contours are for the 4-5 $\sigma$ levels ( upper left), 3.5-4 $\sigma$ levels ( upper right) and 3-3.5 $\sigma$ levels ( low center).
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 14: Source 1 for the 10-7 combination scale in the B (a), V (b) and R (c) bands.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 15: Source 2 for the 10-7 combination scale in the B (a), V (b) and R (c) bands.
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$\begin{figure} \par\centerline{\qquad\qquad\qquad\qquad\qquad(a) \qquad\qquad\qq... ...{2.2cm}} \par {\qquad\qquad\qquad\qquad\qquad\qquad\qquad (c)} \par\end{figure}$	Figure 16: Source 3 for the 10-7 combination scale in the B (a), V (b) and R (c) bands.
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