peculiar velocity

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Noun1.peculiar velocity - velocity with respect to the local standard of rest
speed, velocity - distance travelled per unit time
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There's about 10-20% uncertainty in the peculiar velocity measurement for an individual galaxy.
The galaxy density field shows you where there are concentrations of matter, and the peculiar velocity field points in the direction of the net effect of all the local over- and under-densities.
As shown below this definition implies that the peculiar velocity is a time varying velocity of light, and therefore a new definition is proposed where the speed of light is constant.