The bulk motion of flat edge-on galaxies based on 2MASS photometry

We report the results of applying the 2MASS Tully-Fisher (TF) relations to study galaxy bulk flows. For 1141 all-sky distributed flat RFGC galaxies we construct J, H, K-s TF relations and find that Kron J(fe) magnitudes show the smallest dispersion on the TF diagram. For the sample of 971 RFGC galaxies with V-3K<18000 km s(-1) we find a dispersion σ(TF)=0.42(m) and an amplitude of bulk flow V=199±61 km s(-1), directed towards l=301°±18°, b=-2°±15°. Our determination of low-amplitude coherent flow is in good agreement with a set of recent data derived from EFAR, PSCz and SCI/SCII samples. The resultant two-dimensional smoothed peculiar velocity field traces well the large-scale density variations in the galaxy distributions. The regions of large positive peculiar velocities lie in the direction of the Great Attractor and Shapley concentration. A significant negative peculiar velocity is seen in the direction of Bootes and in the direction of the Local void. A small positive peculiar velocity (100-150 km s(-1)) is seen towards the Pisces-Perseus supercluster, as well as the Hercules-Coma-Corona Borealis supercluster regions.