Skip to main content
eScholarship
Open Access Publications from the University of California

UC Berkeley

UC Berkeley Previously Published Works bannerUC Berkeley

Improving photometric redshifts with Lyα tomography

  • Author(s): Schmittfull, M;
  • White, M
  • et al.
Abstract

Forming a 3D view of the Universe is a long-standing goal of astronomical observations, and one that becomes increasingly difficult at high redshift. In this paper, we discuss how tomography of the intergalactic medium (IGM) at z ∞ 2.5 can be used to estimate the redshifts of massive galaxies in a large volume of the Universe based on spectra of galaxies in their background. Our method is based on the fact that hierarchical structure formation leads to a strong dependence of the halo density on large-scale environment. A map of the latter can thus be used to refine our knowledge of the redshifts of haloes and the galaxies and active galactic nuclei which they host. We show that tomographic maps of the IGM at a resolution of 2.5 h-1 Mpc can determine the redshifts of more than 90 per cent of massive galaxies with redshift uncertainty Δz/(1 + z) = 0.01. Higher resolution maps allow such redshift estimation for lower mass galaxies and haloes.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View