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

In summary, the person has been trying to determine the rotation speed of the Earth and the galactic arms using graphs of Hydrogen Intensity vs Frequency for a radio telescope. They need to measure the doppler shift, but are unsure which spikes correspond to the sun or the galactic arms. They have figured out most of the information, but still need help determining which spike is from the sun.
  • #1
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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  • #2
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:

1. What is radio spectroscopy?

Radio spectroscopy is a scientific technique used to study the properties of matter by analyzing the electromagnetic radiation it emits or absorbs. It involves creating a graph of the intensity of radio waves at different frequencies, which can reveal information about the composition and movement of objects in space.

2. How does radio spectroscopy help in finding the doppler shift?

The doppler shift is a change in frequency that occurs when an object moving towards or away from an observer emits or absorbs electromagnetic radiation. Radio spectroscopy can detect this shift by measuring the difference in frequency between the emitted and received radio waves, which can then be used to calculate the object's velocity.

3. What can the doppler shift in a radio spectroscopy graph tell us?

The doppler shift in a radio spectroscopy graph can tell us the velocity, direction, and distance of an object emitting or absorbing radio waves. It can also reveal other properties such as the temperature, density, and chemical composition of the object.

4. How is the doppler shift calculated in a radio spectroscopy graph?

The doppler shift is calculated by measuring the difference in frequency between the emitted and received radio waves and using the formula v = c * (Δf/f), where v is the velocity of the object, c is the speed of light, Δf is the change in frequency, and f is the original frequency of the emitted radio waves.

5. What are some applications of radio spectroscopy in scientific research?

Radio spectroscopy has many applications in scientific research, including studying the properties and movements of celestial objects such as stars, galaxies, and planets. It is also used in Earth-based research to study the atmosphere and collect data on weather patterns. Additionally, radio spectroscopy is used in chemistry and biology to analyze the chemical composition and structure of molecules and cells.

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