Tomographic Magnification of Lyman Break Galaxies in The Deep Lens Survey

Understand

Using about 450,000 galaxies in the Deep Lens Survey, we present a detection of the gravitational magnification of z > 4 Lyman Break Galaxies by massive foreground galaxies with 0.4 < z < 1.0, grouped by redshift.

• The magnification signal is detected at S/N greater than 20, and rigorous checks confirm that it is not contaminated by any galaxy sample overlap in redshift.
• The inferred galaxy mass profiles are consistent with earlier lensing analyses at lower redshift.
• We then explore the tomographic lens magnification signal by splitting our foreground galaxy sample into 7 redshift bins.