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Homework Help: Optical extinction

  1. Jan 28, 2008 #1
    Help Needed! Optical extinction

    1. The problem statement, all variables and given/known data

    Spherical cloud (gas to dust ratio 100) with mass = 1 M(sun), diameter = 1pc. Radial density can be described by power law (see below). Determine the maximum optical extinction, ie. the function [tex]A_{v}(\alpha)[/tex].

    2. Relevant equations

    Power law: [tex]\rho(r) \propto r^{-\alpha}[/tex]

    You may use [tex]N(H)=6.93*10^{21} cm^{-2}*A_{v}/R_{v}[/tex] and [tex]R_{v}=3[/tex]

    3. The attempt at a solution

    I've looked up column density and found extinction values calculated by flux, but simply can't see where to even begin. A nudge in the right direction would be so very helpful!
    Last edited: Jan 29, 2008
  2. jcsd
  3. Jan 30, 2008 #2
    Please, anyone?
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