| Spiral/Lenticular Galaxies |
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| • | Analogous
relationship to the ellipticals’ |
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| Faber-Jackson
relation is the Tully- |
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| Fisher
relation: |
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| – | The
width of 21cm H I line, corrected for |
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| inclination,
correlates with luminosity. |
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| – | Again,
can make a spectral measurement |
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| plus
a magnitude to estimate a distance. |
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