We present a weak lensing and photometric study of six 0 \fdg 5 \times 0 \fdg 5 fields observed at the 3.6m CFHT telescope using the 8192 \times 8192 pixel UH8K CCD mosaic camera .
The six fields were chosen to be “ blank fields ” i.e .
representative views of the Universe .
The fields were observed for a total of 2 hours each in I and V , resulting in catalogs containing \sim 20 , 000 galaxies per passband per field .
We used V - I color and I magnitude to select bright early type galaxies at redshifts 0.1 < z < 0.9 .
We measured the gravitational shear from faint galaxies in the range 21 < m _ { I } < 25 from a composite catalog and found a strong correlation with that predicted from the early types if they trace the mass with M / L _ { B } \simeq 300 \pm 75 ~ { } { h } { M _ { \odot } / L _ { \odot } } for a flat ( \Omega _ { { m } 0 } = 0.3 , \Omega _ { \lambda 0 } = 0.7 ) lambda cosmology and M / L _ { B } \simeq 400 \pm 100 ~ { } { h } { M _ { \odot } / L _ { \odot } } for Einstein-de Sitter .
We made two-dimensional reconstructions of the mass surface density .
Cross-correlation of the measured mass surface density with that predicted from the early type galaxy distribution showed a strong peak at zero lag ( significant at the 5.2 \sigma level ) .
We azimuthally averaged the cross- and auto-correlation functions .
We concluded that the profiles were consistent with early type galaxies tracing mass on scales of \geq 45 \arcsec ( \geq 200 ~ { } { h } ^ { -1 } { kpc } at z = 0.5 ) .
We sub-divided our bright early type galaxies by redshift and obtained similar conclusions .
These M / L _ { B } ratios imply \Omega _ { m 0 } \simeq 0.10 \pm 0.02 ( \Omega _ { m 0 } \simeq 0.13 \pm 0.03 for Einstein-de Sitter ) of closure density .