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

AI Thread Summary
The discussion revolves around identifying the Doppler shift in graphs related to Hydrogen Intensity versus Frequency, generated from a radio telescope observing the sun and galactic arms. The user is attempting to determine the rotation speed of the Earth and the galactic arms but is struggling to identify which spectral spikes correspond to the sun and which to the galactic arms. After some progress, the user seeks assistance specifically in pinpointing the spike that originates from the sun, debating between a thin intense spike and a thicker one. The graphs provided are crucial for this analysis, but clarity on the source of the spikes remains unresolved. The inquiry highlights the challenges faced in radio spectroscopy and the need for expert guidance in interpreting the data.
PhysicsHelp12
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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.


http://img220.imageshack.us/img220/5904/helpgraphia6.jpg


http://img139.imageshack.us/img139/8038/graph1nr8.jpg



http://img139.imageshack.us/img139/4486/graph2pp2.jpg

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?
 
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PhysicsHelp12 said:
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.


http://img220.imageshack.us/img220/5904/helpgraphia6.jpg


http://img139.imageshack.us/img139/8038/graph1nr8.jpg



http://img139.imageshack.us/img139/4486/graph2pp2.jpg

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?




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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