The will open new ways to study the evolution of the radio
properties of galaxies with redshift directly. The strong (AGN)
radio source population clearly evolves with cosmological epoch -- the
apparent density of sources increases rapidly with redshift. This also
seems to be true for optically selected, often radio weak or silent,
QSOs. Not far below the 3CR flux density limit, most sources are at
high redshifts (z 
1 and many as high as z = 3 to 5). Recently,
the IRAS catalog has added a sample in which dust and molecular
emission can be detected beyond z = 2. Closer by, the Hubble Space
Telescope has imaged clusters of galaxies beyond z = 0.4, confirming
that the Butcher-Oemler effect (the blueing of cluster galaxy
populations with redshift) is related to increased star formation in
clusters at higher redshifts and that galaxies themselves have
different shapes as we look further back. The direct study of the
evolution and possibly the formation of galaxies appears to be a real
possibility. The enhanced VLA would play a crucial rôle in this
arena through detailed exploration of i) the evolution of radio source
populations; ii) molecules, dust and free-free emission in distant
galaxies; iii) starbursts at high redshifts; and iv) Faraday rotation
in magnetized gas-rich environments.
Technical requirements: