  We investigate the dependences of galaxy star-formation history and galaxy
morphology on environment, using color and H-alpha equivalent width as
star-formation history indicators, using concentration and central surface
brightness as morphological indicators, and using clustocentric distance as an
environment indicator. Clustocentric distance has the virtue that it can be
measured with very high precision over a large dynamic range. We find the
following asymmetry between morphological and star-formation history
parameters: star-formation history parameters relate directly to the
clustocentric distance while morphological parameters relate to the
clustocentric distance only indirectly through their relationships with
star-formation history. This asymmetry has important implications for the role
that environment plays in shaping galaxy properties and it places strong
constraints on theoretical models of galaxy formation. Current semi-analytic
models do not reproduce this effect.
