Probing Beyond the Epoch of Hydrogen Reionization with 21 Centimeter Radiation

Details Probing Beyond the Epoch of Hydrogen Reionization with 21 Centimeter Radiation Probing Beyond the Epoch of Hydrogen Reionization with 21 Centimeter Radiation

2003-03-12

arxiv.org/abs/astro-ph/0303249v2

Astrophys.J.596:1-8,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures, ApJ in press, minor revisions

Scientific paper

10.1086/377634

We use numerical simulations of hydrogen reionization by stellar sources in the context of LCDM cosmogonies to investigate the 21 (1+z) cm radio signal expected from the diffuse intergalactic medium (IGM) prior to the epoch of reionization breakthrough at redshift z_ion. Two reionization scenarios are analyzed in details: an `early reionization' case with z_ion~13, consistent with the recent discovery by the WMAP satellite of a large optical depth to Thomson scattering, and a `late reionization' case with z_ion~8. It is a generic prediction of these models that the background of Lyalpha photons produced by the early generation of stars which ultimately ionize the universe will be sufficiently intense to make intergalactic neutral hydrogen visible against the cosmic microwave background during the `grey age', i.e. z_ion

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