Tomographic Magnification of Lyman Break Galaxies in The Deep Lens Survey

Дата и время публикации : 2012-04-12T20:00:06Z

Авторы публикации и институты :
Christopher B. Morrison
Ryan Scranton
Brice Ménard
Samuel J. Schmidt
J. Anthony Tyson
Russell Ryan
Ami Choi
David Wittman

Ссылка на журнал-издание: MNRAS 426, 2489 (2012)
Коментарии к cтатье: 12 pages, 9 figures, Accepted to MNRAS
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: 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. Combining galaxy-magnification cross-correlations and galaxy angular auto-correlations, 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 > 7.5{sigma} with a fixed sigma_8 and is found to be consistent with the expected redshift-dependence of the WMAP7 {Lambda}CDM cosmology.

Category: Physics