Peculiar Velocities of Nearby Galaxies

The Local Volume (10Mpc) is deep inside the cosmic cell of matter uniformity, the galaxies in the Local region are highly clumped. However, the Hubble flow start just outside the bound of Local Group ∼1Mpc and their random motions are surprisingly small. Over the last five years, members of our team have participated in two snapshot surveys of nearby galaxies using WFPC2 aboard HST, which have provided us with the material for distances of about 7-10% accuracy. Further significant progress has been made with HST/ACS pointed observations. Now we have very accurate distances for more than 200 galaxies within ∼6 Mpc. The masses of Local Group (1.2 10¹²), M81 (3.8 10¹²), Cen A (3.3 10¹²) was estimated by its influence on expansion of Local Volume. This method estimates the mass of group on scale 1 Mpc and is independent from estimations by virial theorem . The residual velocity field shows strong anisotropy which is connected to Local Supercluster plane, but main direction significantly differs from direction to the centre of Virgo Cluster. The velocity dispersion of field galaxies is less than 43 km/s.