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

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SUMMARY

This discussion focuses on identifying the Doppler shift in graphs related to Hydrogen Intensity vs Frequency obtained from a radio telescope observing the sun and galactic arms. The user seeks assistance in distinguishing between the spectral spikes corresponding to the sun and those from the galactic arms to calculate the rotation speed of the Earth and the galaxy. After initial confusion, the user narrows down potential candidates for the sun's signal to either a thin intense spike or a thicker one present in all graphs.

PREREQUISITES
  • Understanding of Doppler shift in astrophysics
  • Familiarity with radio spectroscopy techniques
  • Basic knowledge of graph interpretation in scientific data
  • Experience with analyzing spectral data from radio telescopes
NEXT STEPS
  • Research methods for identifying spectral lines in radio astronomy
  • Learn about the characteristics of Hydrogen spectral lines
  • Study the principles of Doppler effect in astrophysical contexts
  • Explore software tools for analyzing and visualizing spectral data
USEFUL FOR

Astronomers, astrophysics students, and researchers involved in radio spectroscopy and spectral analysis of celestial bodies will benefit from this discussion.

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?
 
Last edited by a moderator:
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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
 
Last edited by a moderator:

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