Dark matter and the velocity field of galaxies in the local universe

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Unidentified dark matter outweighs the luminous matter (stars, gas, and galaxies) by several times. Dark matter is detected by its gravitational effects in the Universe. Two recent surveys have been completed using unique Australian facilities, the HI Parkes All Sky Survey and the Six Degree Field galaxy survey. The flow field of galaxies will be measured from these surveys. This project will provide a return on the community investment in these surveys, by mapping the distribution of dark matter. This work, together with a successor survey, the Australian Square Kilometre Array Pathfinder all sky survey, scheduled to begin in 2013, will put Australian astronomers clearly in the lead in understanding the distribution of dark matter.