An MCMC approach to extracting the global 21-cm signal during the cosmic dawn from sky-averaged radio observations

Geraint J A Harker, Jonathan R. Pritchard, Jack O. Burns, Judd Bowman

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Efforts are being made to observe the 21-cm signal from the 'cosmic dawn' using sky-averaged observations with individual radio dipoles. In this paper, we develop a model of the observations accounting for the 21-cm signal, foregrounds and several major instrumental effects. Given this model, we apply Markov Chain Monte Carlo techniques to demonstrate the ability of these instruments to separate the 21-cm signal from foregrounds and quantify their ability to constrain properties of the first galaxies. For concreteness, we investigate observations between 40 and 120MHz with the proposedDark Ages Radio Explorermission in lunar orbit, showing its potential for science return.

Original languageEnglish (US)
Pages (from-to)1070-1084
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume419
Issue number2
DOIs
StatePublished - Jan 1 2012

Keywords

  • Cosmology: theory
  • Diffuse radiation
  • Methods: statistical
  • Radio lines: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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