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Please Help. Radio Spectroscopy -> Finding the doppler shift in a graph

  1. Mar 13, 2008 #1
    I've been trying this for 3 hours and I'm getting nowhere. These are the graphs I made for Hydrogen Intensity vs Frequency for a radio telescope that transits the sun and galactic arms of the galaxy.




    I need to find the rotation speed of the earth and the galactic arms. So I know I need to measure the doppler shift ...but my problem is, I don't know which spikes correspond to what. What spikes are from the sun or local space and which are from the galactic arms.

    Anybody please help?
  2. jcsd
  3. Mar 14, 2008 #2

    Nevermind this I figured most of it out ---

    but can someone please help me determine which spike comes from the sun?

    I know it's either the really thin intense one that's on all 3 ...but that looks more like a stray point to me ....or it's the other really large one that's thicker
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