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Deep Lens Survey

Overview

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

PI(s) Tony Tyson,
David Wittman, and
Ian Dell'Antonio
Proposal ID 1999B-0018
Years of Observation 1999-2004
Area covered: 20 sq. degrees comprising 5 contiguous 2 x 2 degree patches
Field Centers:
Field RA Dec l, b Ecliptic
F1 00:53:25.3 +12:33:55 125, -50 17, 6
F2 09:19:32.4 +30:00:00 197, 44 133, 14
F3 05:20:00 -49:00:00 255, -35 69, -72
F4 10:52:00 -05:00:00 257, 47 166, -11
F5 13:59:20 -11:03:00 328, 49 212, 1
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