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

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

2011-07-15

arxiv.org/abs/1107.3154v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 14 figures; accepted by MNRAS; minor edits to match accepted version

Scientific paper

10.1111/j.1365-2966.2011.19766.x

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 120 MHz with the proposed DARE mission in lunar orbit, showing its potential for science return.

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