Cosmic radio dipole from NVSS and WENSS

TL;DR

This paper analyzes the cosmic radio dipole using NVSS and WENSS surveys, addressing biases and comparing estimators, finding a larger dipole amplitude than expected from the CMB, challenging the pure kinetic origin hypothesis.

Contribution

It introduces a comprehensive comparison of estimators for the cosmic radio dipole and clarifies discrepancies in previous claims, confirming a larger-than-expected dipole amplitude.

Findings

NVSS and WENSS dipole estimates are consistent with each other and the CMB dipole direction.

Measured radio dipole amplitude exceeds the CMB expectation by a factor of about 3.

Radio dipole is inconsistent with a purely kinetic origin at 99.5% confidence level.

Abstract

We use linear estimators to determine the magnitude and direction of the cosmic radio dipole from the NRAO VLA Sky Survey (NVSS) and the Westerbork Northern Sky Survey (WENSS). We show that special attention has to be given to the issues of bias due to shot noise, incomplete sky coverage and masking of the Milky Way. We compare several different estimators and show that conflicting claims in the literature can be attributed to the use of different estimators. We find that the NVSS and WENSS estimates of the cosmic radio dipole are consistent with each other and with the direction of the cosmic microwave background (CMB) dipole. We find from the NVSS a dipole amplitude of $(1.6 \pm 0.6) \times 10^{-2}$ in direction $(\mathrm{RA}, \mathrm{dec})= (154^\circ \pm 21^\circ, -2^\circ \pm 21^\circ)$. This amplitude exceeds the one expected from the CMB by a factor of about 3 and is inconsistent with the assumption of a pure kinetic origin of the radio dipole at 99.5% CL.