| Galaxies within Clusters |
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| • | A
range of structural types (Oemler 1974) |
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| – | cD
clusters have 1 or 2 central dominant cD |
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| galaxies,
and no more than about 20% spirals, |
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| with
a E: S0: S ratio of 3: 4: 2. |
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| – | Spiral-rich
clusters have E : S0 : S ratios more |
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| like
1: 2: 3 – about half spirals. |
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| – | Remainder
are spiral-poor clusters. No |
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| dominant
cD galaxy and typical ratio of 1: 2: 1. |
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