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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(A galaxy recedes faster the farther away it is.) 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." "The BOSS data are awe-inspiring," says Martin White, "but many other pieces had to be put into place before we could get what we're after out of the data." Complex computer algorithms were essential for reconciling the inherent uncertainties.
2 Definition of the luminosity distance and the peculiar velocity from light propagation