Is Surface Density of Starlight Synonymous with Surface Brightness?

Zaphodx57x
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I have a problem that asks for the surface density of starlight at 8 kpc for a particular spiral galaxy.

I have all the information to calculate surface brightness. Does "surface density of starlight" mean "surface brightness", or are these completely different things?
 
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I've never heard the term "surface density of starlight." It probably means number of photons per unit area, or flux per unit area.

- Warren
 
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