On 12/9/2017 10:38 AM, [email protected] wrote:
But you don't know which part of the shift of the H is due to cosmological expansion, so that's why the method I described seems necessary. You must estimate how much is due to expansion alone via distance knowledge and Hubble's law, and then calculate the difference between the total H red shift and what expansion would give in the absence of Doppler, to get the actual Doppler shift. AG
It's all Doppler shift, you are apparently worrying about peculiar velocities of galaxies as would be measured by astronmers in the galaxy relative to the CMB. These may be of interest but they are at the level of a small noise on top of the Doppler due to expansion of the universe.
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