All Figures

$\begin{figure} \par\includegraphics[angle=270,width=6.6cm,clip]{7243f1.ps}\end{figure}$ Figure 1: r'-i' vs. i' color magnitude relation for the Cl J1216+3318 field of view. The larger (red) filled circles are the galaxies included within the X-ray contours.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.65cm,clip]{7243f2.ps}\end{figure}$ Figure 2: Cl J1651+6107: central surface brightness versus total r' magnitude diagram used to distinguish stars from galaxies, see text.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.75cm,clip]{7243f3.ps}\end{figure}$ Figure 3: Log-normal Cl J1651+6107 r' magnitude histogram for the Gemini field, suggesting completeness up to $r'\sim$ 24.5.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.6cm,clip]{7243f4.ps}\end{figure}$ Figure 4: Cl J1651+6107: r'-i' color versus r' magnitude for objects classified as galaxies. The 7 large (red) circles correspond to the galaxies within the X-ray contours.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=7.5cm,clip]{7243f5.ps}\end{figure}$ Figure 5: BVR color image of Cl J1120+1254. The two bright objects at the image bottom (one blue, one red) are the brightest objects within the X-ray contours.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=7.4cm,clip]{7243f6.ps}\end{figure}$ Figure 6: A known galaxy structure, ClG J1205+4429 ( top) with a line-of-sight X-ray detectable AGN in the upper left of the image, see Ulmer et al. (2005). [0.5-2.0] keV ( left) and [2.0-10.0] keV band ( right). Similar images of Cl J1120+1254 ( bottom).
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.8cm,clip]{7243f7.ps}\end{figure}$ Figure 7: Log-normal Cl J0223-0856 R magnitude histogram. The vertical (red) lines are the four objects detected within the X-ray contours.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.7cm,clip]{7243f8.ps}\end{figure}$ Figure 8: X-ray photon spectrum of Cl J1202+4439.
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In the text

$\begin{figure} \par\includegraphics[width=7.35cm,clip]{7243f9.ps}\end{figure}$ Figure 9: A serendipitously detected galaxy structure in the Cl J1050+6317 field of view. White contours are X-ray ROSAT PSPC data.
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In the text

$\begin{figure} \par\includegraphics[width=7.35cm,clip]{7243f10.eps}\end{figure}$ Figure 10: Figure 10 of Barkhouse et al. (2006) showing the distribution of X-ray luminosity (0.5-2.0 keV) as a function of redshift. Open circles are the Barkhouse et al. (2006) extended X-ray sources associated with clusters and the open triangles are extended X-ray sources associated with nearby galaxies. Other symbols are from literature studies (see Barkhouse et al. 2006, for details). Our data are shown with large black filled circles.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa1.ps}\end{figure}$ Figure A.1: R band OHP image for Cl J0223-0856 (completeness level: $R\sim$ 20). The field is $4.2\times 4.2$ arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa2.ps}\end{figure}$ Figure A.2: $\chi ^2$ image for Cl J0240-0801 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa3.ps}\end{figure}$ Figure A.3: I image for Cl J0241-0802 observed at ESO (completeness level: $I\sim$ 21). The field is 2 $\times$ 2 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa4.ps}\end{figure}$ Figure A.4: $\chi ^2$ image for Cl J0242-0756 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa5.ps}\end{figure}$ Figure A.5: $\chi ^2$ image for Cl J0254+0012 built from the DSS red and blue images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa6.ps}\end{figure}$ Figure A.6: $\chi ^2$ image for Cl J0302-1526 built from the DSS red and blue images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa7.ps}\end{figure}$ Figure A.7: $\chi ^2$ image for Cl J0317-0259 built from the DSS red and blue images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa8.ps}\end{figure}$ Figure A.8: R band OHP image for Cl J0413+1215 (completeness level: $R\sim$ 21.5). The field is 4.2 $\times$ 4.2 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa9.ps}\end{figure}$ Figure A.9: R band OHP image for Cl J0922+6217 (completeness level: $R\sim$ 20). The field is 4.2 $\times$ 4.2 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa10.ps}\end{figure}$ Figure A.10: i' image for Cl J0937+6105 observed at ARC (completeness level: $i'\sim$ 22.5). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa11.ps}\end{figure}$ Figure A.11: i' image for Cl J1024+1935 observed at ARC (completeness level: $i'\sim$ 23). The field is 3 $\times$ 3 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa12.ps}\end{figure}$ Figure A.12: i' image for Cl J1024+1943 observed at ARC (completeness level: $i'\sim$ 23.5). The field is 3 $\times$ 3 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa13.ps}\end{figure}$ Figure A.13: i' image for Cl J1050+6317 observed at ARC (completeness level: $i'\sim$ 23). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa14.ps}\end{figure}$ Figure A.14: $\chi ^2$ image for Cl J1052+5655 built from the SDSS u, g', r', i'and z' images. The field is 5.9 $\times$ 5.9 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa15.ps}\end{figure}$ Figure A.15: i' image for Cl J1052+5400 observed at ARC (completeness level: $i'\sim$ 24). The field is 1.8 $\times$ 1.8 arcmin². The X-ray source is from ROSAT data but is not confirmed by the available XMM data.

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa16.ps}\end{figure}$ Figure A.16: i' image for Cl J1102+2514 observed at ARC (completeness level: $i'\sim$ 23). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa17.ps}\end{figure}$ Figure A.17: $\chi ^2$ image for Cl J1103+2458 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa18.ps}\end{figure}$ Figure A.18: i' image for Cl J1113+4042 observed at ARC (completeness level: $i'\sim$ 23.5). The field is 3 $\times$ 3 arcmin². Overlayed X-ray contours are Chandra data.

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa19.ps}\end{figure}$ Figure A.19: R image for Cl J1120+1254 observed at CFHT (completeness level: $R\sim$ 22). The field is 1.8 $\times$ 1.8 arcmin². Overlayed X-ray contours are XMM data.

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa20.ps}\end{figure}$ Figure A.20: $\chi ^2$ image for Cl J1121+4309 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa21.ps}\end{figure}$ Figure A.21: i' image for Cl J1121+0338 observed at ARC (completeness level: $i'\sim$ 23.5). The field is 3 $\times$ 3 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa22.ps}\end{figure}$ Figure A.22: $\chi ^2$ image for Cl J1158+5541 built from the SDSS u, g', r', i'and z' images. The field is 3.7 $\times$ 3.7 arcmin². Overlayed X-ray contours are XMM data.

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa23.ps}\end{figure}$ Figure A.23: $\chi ^2$ image for Cl J1202+4439 built from the SDSS u, g', r', i'and z' images. The field is 3.7 $\times$ 3.7 arcmin². Overlayed X-ray contours are XMM data.

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa24.ps}\end{figure}$ Figure A.24: $\chi ^2$ image for Cl J1207+4429 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa25.ps}\end{figure}$ Figure A.25: i' image for Cl J1213+3908 observed at ARC (completeness level: $i'\sim$ 22.5). The field is 3 $\times$ 3 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa26.ps}\end{figure}$ Figure A.26: $\chi ^2$ image for Cl J1213+3317 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa27.ps}\end{figure}$ Figure A.27: I image for Cl J1214+1254 observed at ESO (completeness level: $I\sim$ 21). The field is 2 $\times$ 2 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa28.ps}\end{figure}$ Figure A.28: i' image for Cl J1216+3318 observed at ARC (completeness level: $i'\sim$ 23.5). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa29.ps}\end{figure}$ Figure A.29: $\chi ^2$ image for Cl J1234+3755 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa30.ps}\end{figure}$ Figure A.30: $\chi ^2$ image for Cl J1237+2800 built from the SDSS u, g', r', i'and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa31.ps}\end{figure}$ Figure A.31: $\chi ^2$ image for Cl J1259+2547 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa32.ps}\end{figure}$ Figure A.32: $\chi ^2$ image for Cl J1343+2716 built from the SDSS u, g', r', i' and z' images. The field is 3.7 $\times$ 3.7 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa33.ps}\end{figure}$ Figure A.33: i' image for Cl J1350+6028 observed at ARC (completeness level: $i'\sim$ 23). The field is 3 $\times$ 3 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa34.ps}\end{figure}$ Figure A.34: i' image for Cl J1411+5933 observed at ARC (completeness level: $i'\sim$ 23.5). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa35.ps}\end{figure}$ Figure A.35: i' image for Cl J1514+4351 observed at ARC (completeness level: $i'\sim$ 22.5). The field is 1.8 $\times$ 1.8 arcmin².

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7243fa36.ps}\end{figure}$ Figure A.36: r' image for Cl J1651+6107 observed at Gemini (completeness level: $r'\sim$ 24.5). The field is 1.7 $\times$ 1.1 arcmin². Overlayed X-ray contours are XMM data. Circled objects are stars confirmed by spectroscopy or image analysis.

In the text

$\begin{figure} \par\includegraphics[angle=270,width=6.6cm,clip]{7243f1.ps}\end{figure}$	Figure 1: r'-i' vs. i' color magnitude relation for the Cl J1216+3318 field of view. The larger (red) filled circles are the galaxies included within the X-ray contours.
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$\begin{figure} \par\includegraphics[angle=270,width=6.65cm,clip]{7243f2.ps}\end{figure}$	Figure 2: Cl J1651+6107: central surface brightness versus total r' magnitude diagram used to distinguish stars from galaxies, see text.
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$\begin{figure} \par\includegraphics[angle=270,width=6.75cm,clip]{7243f3.ps}\end{figure}$	Figure 3: Log-normal Cl J1651+6107 r' magnitude histogram for the Gemini field, suggesting completeness up to $r'\sim$ 24.5.
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$\begin{figure} \par\includegraphics[angle=270,width=6.6cm,clip]{7243f4.ps}\end{figure}$	Figure 4: Cl J1651+6107: r'-i' color versus r' magnitude for objects classified as galaxies. The 7 large (red) circles correspond to the galaxies within the X-ray contours.
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$\begin{figure} \par\includegraphics[angle=270,width=7.5cm,clip]{7243f5.ps}\end{figure}$	Figure 5: BVR color image of Cl J1120+1254. The two bright objects at the image bottom (one blue, one red) are the brightest objects within the X-ray contours.
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$\begin{figure} \par\includegraphics[angle=270,width=7.4cm,clip]{7243f6.ps}\end{figure}$	Figure 6: A known galaxy structure, ClG J1205+4429 ( top) with a line-of-sight X-ray detectable AGN in the upper left of the image, see Ulmer et al. (2005). [0.5-2.0] keV ( left) and [2.0-10.0] keV band ( right). Similar images of Cl J1120+1254 ( bottom).
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$\begin{figure} \par\includegraphics[angle=270,width=6.8cm,clip]{7243f7.ps}\end{figure}$	Figure 7: Log-normal Cl J0223-0856 R magnitude histogram. The vertical (red) lines are the four objects detected within the X-ray contours.
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$\begin{figure} \par\includegraphics[angle=270,width=6.7cm,clip]{7243f8.ps}\end{figure}$	Figure 8: X-ray photon spectrum of Cl J1202+4439.
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$\begin{figure} \par\includegraphics[width=7.35cm,clip]{7243f9.ps}\end{figure}$	Figure 9: A serendipitously detected galaxy structure in the Cl J1050+6317 field of view. White contours are X-ray ROSAT PSPC data.
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