The Kaiser-Rocket effect: three decades and counting

Understand

The peculiar motion of the observer, if not accurately accounted for, is bound to induce a well-defined clustering signal in the distribution of galaxies.

• This signal is related to the Kaiser rocket effect.
• Here we examine the amplitude and form of this effect, both analytically and numerically, and discuss possible implications for the analysis and interpretation of forthcoming cosmological surveys.
• For an idealistic cosmic variance dominated full-sky survey with a Gaussian selection function peaked at $z\sim 1.5$ it is a $> 5\sigma$ effect and it can in principle bias very significantly the inference of cosmological parameters, especially for primordial non-Gaussianity.