A weak lensing view of the downsizing of star-forming galaxies
  We describe a weak lensing view of the downsizing of star forming galaxies
based on cross correlating a weak lensing ($\kappa$) map with a predicted map
constructed from a redshift survey. Moderately deep and high resolution images
with Subaru/Hyper Suprime-Cam covering the 4 deg^2 DLS F2 field provide a
$\kappa$ map with 1 arcmin resolution. A dense complete redshift survey of the
F2 field including 12,705 galaxies with $R\leq20.6$ is the basis for
construction of the predicted map. The zero-lag cross-correlation between the
\kappa and predicted maps is significant at the $30\sigma$ level. The width of
the cross-correlation peak is comparable with the angular scale of rich cluster
at $z\sim0.3$, the median depth of the redshift survey. Slices of the predicted
map in $\delta{z} = 0.05$ redshift bins enable exploration of the impact of
structure as a function of redshift. The zero-lag normalised cross-correlation
has significant local maxima at redshifts coinciding with known massive X-ray
clusters. Even in slices where there are no known massive clusters, there is
significant signal in the cross-correlation originating from lower mass groups
that trace the large-scale of the universe. Spectroscopic $D_n4000$
measurements enable division of the sample into star-forming and quiescent
populations. The significance of the cross-correlation with structure
containing star-forming galaxies increases with redshift from $5\sigma$ at $z =
0.3$ to $7 \sigma$ at $z = 0.5$. The weak lensing results are consistent with
the downsizing view of galaxy evolution established on the basis of many other
independent studies.
