The powerful radio source TN J1338-1942 (z=4.1) lies at
the center of a protocluster of star-forming galaxies. The
host galaxy is by far the dominant galaxy in the region, and
is therefore likely to evolve into the brightest cluster
member at low-redshift. In this talk I will present
observations of the TN J1338 field using the Advanced Camera
for Surveys (ACS) on-board the Hubble Space Telescope.
These high spatial-resolution images reveal several
interesting kpc-scale features within the host galaxy. We
interpret some of these as evidence for processes linking
the black-hole, the host galaxy and the surrounding gaseous
medium.
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