The most distant galaxies: probing the early universe

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Powerful radio emission from a galaxy points to the presence of a central supermassive black hole, and is the most effective tool for finding galaxies at the edge of the universe. By using data mining techniques on our existing low-frequency radio images of the southern sky, we will identify 80-100 of the youngest and most distant massive galaxies, by far the largest such sample ever assembled. It will be used to measure the growth of supermassive black holes over time, and to test competing theories of how massive galaxies formed in the early universe.