The Deep Lens Survey is a 20 deg2 ultra-deep multi-band sky survey. The images were taken over about 100 nights on NOAO’s Blanco and Mayall 4-meter telescopes. Publicly available data products include deep images and catalogs.
The main science goal is weak gravitational lensing, in which subtle correlations of the shapes of distant galaxies reveal the intervening mass distribution. Multi-wavelength photometry is used to derive photometric redshifts (approximate distances) to the galaxies. Because distance corresponds to look-back time, the combination of these two techniques unveils the growth of massive structures over cosmic time.
The Deep Lens Survey at a Glance
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|Years of Observation||1999-2004|
|Area covered:||20 sq. degrees comprising 5 contiguous 2 x 2 degree patches|
|Bands||B, V, R, z|
|Median Depth (5σ)||(B, V, R, z) = (26.7, 26.5, 26.7, 24.8)|
|Median Seeing||(B, V, R, z) = (1.2, 1.1, 1.0, 1.1) arcsec|
|Number of images||180|