Detailed Studies of Two Z > 3.5 Radio Galaxies

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Hst Proposal Id #6608 Cosmology

Scientific paper

A moderately deep image {6 hrs, F702W+WFPC2} of one of the highest redshift radio galaxies {4C41.17 at z = 3.80} has shown that the rest-frame UV continuum has 1} numerous bright knots along the inner radio source axis, and 2} a clumpy companion system. Both components appear embedded in a common halo of diffuse emission. These observations suggest that we may be witnessing, for the first time, the formation of a galaxy due to the merging of {star forming?} subclumps, as predicted in dissipative galaxy formation scenarios, and of the effects of a young {quasar like ?} AGN on this environment. We propose to obtain a deep HST rest-frame UV {F702W} image of one other z > 3.5 radio galaxy which we have discovered in our ongoing groundbased surveys: 4C 0512+60 at z = 3.790. Combined with extensive groundbased {Keck} observations and future HST NICMOS near-IR imaging and STIS longslit spectroscopy these data will provide crucial new information about key factors which shape young HZRGs {galaxy, AGN, environment, redshift}, and will allow us to explore the possible connection between galaxy formation and the origin of AGN, and to test certain attributes of radio galaxy / quasar `unification' models.

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