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Figure 1:
Completeness magnitudes of the B- and R-band images, as estimated by comparing the magnitudes in the fixed aperture (
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Figure 2: Photometric properties of sources classified by SExtractor as being stars. ( Top panel) Number-magnitude distribution of stars. The best-fitting power-law function to the counts for 19<R<22 is indicated, as is the R=23 magnitude limit used for analysis of the red sequence galaxy population. ( Bottom panel) B-R colour distribution of 19<R<22 stars, normalised to match the expected level of stellar contamination for 22<R<23. |
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Figure 3: The surface density of R<23.0 galaxies in the field of A 209. The dashed contour corresponds to the field galaxy number density, while the solid contours correspond respectively to 2, 3.3, 5, 7.5, 10, and 12.5 cluster galaxies arcmin-2. The shaded boxes indicate the regions used to represent the field galaxy population. |
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Figure 4: The B-R/R colour-magnitude diagrams of the cluster galaxy population in the three cluster regions corresponding to high-, intermediate-, and low-density environments. Each of the three diagrams is the result of a Monte-Carlo realisation in which field galaxies are subtracted statistically. For comparison the C-M diagram of field galaxies is shown also. In each plot the solid line indicates the best-fitting C-M relation of Eq. (4), and galaxies identified as belonging to the red sequence through Eq. (6) are indicated by solid circles. |
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Figure 5:
The B- and R-band LFs of galaxies in the virial region. The solid curve indicates the best-fitting Schechter function whose parameters are indicated in Table 2. In the small panels, the 1, 2 and ![]() ![]() |
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Figure 6: The B-band LFs of galaxies in the three cluster regions corresponding to high-, intermediate- and low-density environments. |
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Figure 7:
The 1, 2 and ![]() ![]() |
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Figure 8: The R-band LFs of galaxies in the three cluster regions corresponding to high-, intermediate- and low-density environments. |
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Figure 9:
Confidence limits for the best-fitting Schechter parameters ![]() |
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Figure 10:
The R-band LF of red sequence galaxies in the virial region. The solid curve indicates the best-fitting Schechter function whose parameters are indicated in the top-left of each plot. In the small panels, the 1, 2 and ![]() ![]() |
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Figure 11: The R-band LFs of red sequence galaxies in the three cluster regions corresponding to high-, intermediate- and low-density environments. The solid curve indicates the best-fitting Schechter function whose parameters are indicated in the top-left of each plot. |
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Figure 12:
Confidence limits for the best-fitting Schechter parameters ![]() |
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Figure 13: The blue galaxy fraction as a function of local number density. |
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Figure 14: The mean galaxy colour of the cluster galaxy population as a function of spatial position (see text). |
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