Journal Article

Tomographic magnification of Lyman-break galaxies in the Deep Lens Survey

C. B. Morrison, R. Scranton, B. Ménard, S. J. Schmidt, J. A. Tyson, R. Ryan, A. Choi and D. M. Wittman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 3, pages 2489-2499
Published in print November 2012 | ISSN: 0035-8711
Published online November 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21826.x
Tomographic magnification of Lyman-break galaxies in the Deep Lens Survey

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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 a signal-to-noise ratio 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 seven redshift bins. Combining galaxy-magnification cross-correlations and galaxy angular autocorrelations, we develop a bias-independent estimator of the tomographic signal. As a diagnostic of magnification tomography, the measurement of this estimator rejects a flat, dark matter-dominated universe at >7.5σ with a fixed σ8 and is found to be consistent with the expected redshift dependence of the Wilkinson Microwave Anisotropy Probe 7 Λ cold dark matter cosmology.

Keywords: gravitational lensing: weak; galaxies: haloes; galaxies: high-redshift; cosmology: observations; large-scale structure of Universe

Journal Article.  7910 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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