Andromeda wavelengths calculation

In summary, the conversation discusses the calculation of a wavelength observed in a spectrum from Andromeda using the formula z = ∆λ/λ0 and z = v/c. The calculated value was smaller than λ0 due to the blue shift observed in Andromeda. It is also mentioned that calculating the same wavelength using Hubble's law resulted in a different value, larger than λ0. This is because blue shift indicates a decrease in wavelengths while redshift indicates an increase, and the mutual gravitational attraction between galaxies within a local group can affect their relative velocities and cause deviations from Hubble's law.
  • #1
Orion78
25
0
I have calculated the wavelength of a line that would be observed in a spectrum from Andromeda where speed and λ0 were known, using the formula z =∆λ/λ0 and z=v/c. I obtained a value smaller than λ0 because Andromeda display a blue shift. After I calculated the same wavelength pretending that Andromeda obeyed the Hubble relationship and I found a different value, greater than λ0. his is because the blueshift indicates a decrease in wavelengths while the redshift an increase in wavelengths? Thanks!
 
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  • #2
Yes, that sounds right. We cannot expect relative velocities of galaxies withing a local group to obey Hubble's law because of the mutual gravitational attraction between the galaxies.
 

Related to Andromeda wavelengths calculation

1. How do you calculate Andromeda wavelengths?

To calculate Andromeda wavelengths, you would need to use the formula λ = c/f, where λ is the wavelength, c is the speed of light, and f is the frequency. You can also use the formula λ = v/f, where v is the velocity of the wave.

2. What is the significance of calculating Andromeda wavelengths?

Calculating Andromeda wavelengths can provide valuable information about the size and composition of objects in the Andromeda galaxy. It can also help scientists understand the behavior of light and other electromagnetic waves in outer space.

3. How can you measure Andromeda wavelengths?

Andromeda wavelengths can be measured using a variety of instruments, such as spectroscopes or radio telescopes. These tools can detect and analyze the electromagnetic waves emitted by objects in the Andromeda galaxy.

4. What factors can affect the accuracy of Andromeda wavelengths calculations?

The accuracy of Andromeda wavelengths calculations can be affected by factors such as the speed and direction of the object, the presence of any intervening matter, and the sensitivity of the measuring instrument.

5. Are there any real-world applications for Andromeda wavelengths calculations?

Yes, Andromeda wavelengths calculations have real-world applications in fields such as astronomy, astrophysics, and telecommunications. They can help scientists study the properties of distant galaxies and also assist in the development of technologies that utilize electromagnetic waves.

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