Formation of High Redshift Radio Galaxies

Computer Science

Scientific paper

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Hst Proposal Id #9291

Scientific paper

This programme uses ACS observations of high redshift radio galaxies {HzRGs} to investigate massive galaxy and cluster formation in the early Universe. By carrying out deep observations of a few z > 3.8 targets the following four questions will be studied: {1} Are HzRGs massive central-cluster galaxies formed through hierarchical assembly of Lyman break galaxies? Detailed brightness distributions colors and morphologies of HzRG clumps will be measured and compared with those of Lyman break galaxies. {2} Are HzRGs located in dense {proto-} clusters and if so what are the properties of the associated large-scale structures? Lyman alpha excesses, colors and morphologies of objects in field will be used to search for companion galaxies of HzRGs. {3} What are the origin and fate of giant gas halos associated with HzRGs and what role do they play in the formation of massive galaxies? The morphologies and locations of Ly-alpha clumps will be compared with those of continuum clumps. {4} Is nuclear activity a source of star formation in the early Universe? The properties of continuum and Ly-alpha clumps along will be compared in relation to the radio jet.

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