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

Main Question or Discussion Point

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 [Broken]


http://img139.imageshack.us/img139/8038/graph1nr8.jpg [Broken]



http://img139.imageshack.us/img139/4486/graph2pp2.jpg [Broken]

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?
 
Last edited by a moderator:

Answers and Replies

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 [Broken]


http://img139.imageshack.us/img139/8038/graph1nr8.jpg [Broken]



http://img139.imageshack.us/img139/4486/graph2pp2.jpg [Broken]

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
 
Last edited by a moderator:

Related Threads for: Please Help. Radio Spectroscopy -> Finding the doppler shift in a graph

Replies
9
Views
4K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
10K
  • Last Post
Replies
1
Views
4K
Replies
2
Views
3K
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
3
Views
2K
Top