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Is there any (proposed) relation between the B-band isophotal radius of a spiral galaxy and its virial radius (r_200)?

If you know of such a relation, please post a reference paper.

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Virial radius is based on a dynamic calculation, so it would include any alleged dark matter content. An isoPHOTal radius by definition would exclude dark matter. Therefore, either dark matter decouples them entirely, or there must some strict, predictable (assumed?) relation between the B band and the dark matter content, which I believe defeats the purpose. –  Andrew Jan 29 '12 at 2:04
    
@con-f-use: what is "B-band"? –  Peter Mortensen Jan 29 '12 at 15:49
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