A dipole anisotropy of galaxy distribution: Does the CMB rest-frame exist in the local universe?

Understand

The peculiar motion of the Earth causes a dipole anisotropy modulation in the distant galaxy distribution due to the aberration effect.

• However, the amplitude and angular direction of the effect is not necessarily the same as those of the cosmic microwave background (CMB) dipole anisotropy due to the growth of cosmic structures.
• In other words exploring the aberration effect may give us a clue to the horizon-scale physics perhaps related to the cosmic acceleration.
• In this paper we develop a method to explore the dipole angular modulation from the pixelized galaxy data on the sky properly taking into account the covariances due to the shot noise and the intrinsic galaxy clustering contamination as well as the partial sky coverage.