Cosmic radio dipole from NVSS and WENSS

Understand

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.