The Frontier of Reionization: Theory and Forthcoming Observations

  • Abraham Loeb
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)


The cosmic microwave background provides an image of the Universe 0.4 million years after the Big Bang, when atomic hydrogen formed out of free electrons and protons. One of the primary goals of observational cosmology is to obtain follow-up images of the Universe during the epoch of reionization, hundreds of millions of years later, when cosmic hydrogen was ionized once again by the UV photons emitted from the first galaxies. To achieve this goal, new observatories are being constructed, including low-frequency radio arrays capable of mapping cosmic hydrogen through its redshifted 21 cm emission, as well as imagers of the first galaxies such as the James Webb Space Telescope (JWST) and large aperture ground-based telescopes. The construction of these observatories is being motivated by a rapidly growing body of theoretical work. Numerical simulations of reionization are starting to achieve the dynamical range required to resolve galactic sources across the scale of hundreds of comoving Mpc, larger than the biggest ionized regions.


Black Hole Dark Matter Cosmic Microwave Background High Redshift Neutral Hydrogen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media, B.V. 2009

Authors and Affiliations

  • Abraham Loeb
    • 1
  1. 1.Harvard University,CfACambridgeUSA

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