  The effect of environment on the circumgalactic medium (CGM) is investigated
through a comparison of Lya absorption line data in the Virgo Cluster and the
field. This Letter uses the first systematic survey of background QSOs in and
around the Virgo Cluster and large existing surveys of galaxies at low
redshift. While previous studies found denser gas (higher equivalent width)
closer to a galaxy (lower impact parameter), this correlation disappears in the
Virgo environment. In addition, the covering fraction of the CGM is lower in
the cluster environment than in the circumcluster environment and field. The
results indicate that the CGM is suppressed for cluster galaxies while galaxies
in the circumcluster environment have abundant CGM. The truncation of the CGM
may result in the quenching of star formation through starvation. Our results
also show that CGM surveys must consider the role of environment.
