Galaxies and Intergalactic Matter at High Redshift 


It has long been suspected that feedback from supernovae
might have a significant influence on the evolution of
baryons in the universe, preventing most of them from
collapsing into stars, breaking the self-similarity
of the cluster X-ray temperature-luminosity relationship,
polluting the intracluster and intergalactic media with
metals, and so on.  This talk will present results
of a survey aimed at constraining the possible effect
of supernova explosions in galaxies at redshift z~3 upon
their surroundings.  Comparing the locations of galaxies
to the locations of HI and metals in the spectra of background
QSOs shows that the intergalactic medium contains little
HI or CIV within ~0.5 comoving Mpc
of Lyman-break galaxies but a significant excess of both
at slightly larger radii.  The intergalactic medium
within the largest galaxy overdensities at z~3---i.e.,
the presumed young intracluster medium---contains a wealth
of HI and metals.  CIV absorption systems cluster strongly
with galaxies.  Damped Lyman-alpha systems do not.
These results may show that supernovae-driven winds are
able to escape the galaxies' potential wells and drive ~1 comoving
Mpc into the surrounding intergalactic medium.