| Spiral/Lenticular Galaxies |
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| • | Light
Distribution |
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| – | Two
components, spheroid + disk |
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| – | Spheroid
is like a mini-elliptical right down |
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| to
a de Vaucouleur’s law distribution |
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| – | Exponential
disk component: |
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| – | Where
h is the disk scale length (3 kpc for |
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| the
Milky Way), so total L is then 4πh2Io. |
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