High redshift radio galaxies and divergence from the CMB dipole
  Previous studies have found our velocity in the rest frame of radio galaxies
at high redshift to be substantially larger than that inferred from the CMB
temperature dipole anisotropy. We construct a full sky catalogue NVSUMSS, by
merging the NVSS and SUMSS catalogues and removing local sources by various
means including cross-correlating with the 2MRS catalogue. We take into account
both aberration and Doppler boost to deduce our velocity from the hemispherical
number count asymmetry, as well as via a 3-dimensional linear estimator. Both
the magnitude and direction depend on cuts made to the catalogue, e.g. on the
lowest source flux, however these effects are small. With the hemispheric
number count asymmetry method we obtain a velocity of 1729 $\pm$ 187 km/s i.e.
about 4 times larger than that obtained from the CMB dipole, but close in
direction, towards RA=149 $\pm$ 2 degree, DEC = -17 $\pm$ 12 degree. With the
3-dimensional estimator, the derived velocity is 1355 $\pm$ 174 km/s towards
RA=141 $\pm$ 11 degree, DEC=-9 $\pm$ 10 degree. We assess the statistical
significance of these results by constructing catalogues of random
distributions and show that they are at best significant at the $2.81 \sigma$
(99.95% confidence) level.
