hi cosmo-torun There's a very interesting paper by Ashok Singal from Ahmedabad: Large peculiar motion of the solar system from the dipole anisotropy in sky brightness due to distant radio sources Authors: Ashok K. Singal http://arxiv.org/abs/1110.6260 The principle and method are essentially straightforward, the data set is public and the analysis looks simple. The result is that the NVSS velocity dipole for faint radio sources is 4 times bigger than the CMB velocity dipole, but in about the same direction. My speculation is that somewhere there was a multiplication by two instead of dividing by two, but i didn't find it from a quick browse through the paper. If there is no error, then this sounds like a rather huge, large-scale bulk velocity. pozdr boud