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Surface Density of Starlight

  1. Mar 21, 2006 #1
    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?
  2. jcsd
  3. Mar 21, 2006 #2


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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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