The First Stars in the Universe and Cosmic Reionization

  title={The First Stars in the Universe and Cosmic Reionization},
  author={Rennan Barkana},
  pages={931 - 934}
The earliest generation of stars, far from being a mere novelty, transformed the universe from darkness to light. The first atoms to form after the Big Bang filled the universe with atomic hydrogen and a few light elements. As gravity pulled gas clouds together, the first stars ignited and their radiation turned the surrounding atoms into ions. By looking at gas between us and distant galaxies, we know that this ionization eventually pervaded all space, so that few hydrogen atoms remain today… 
The physics and early history of the intergalactic medium
The intergalactic medium?the cosmic gas that fills the great spaces between the galaxies?is affected by processes ranging from quantum fluctuations in the very early Universe to radiative emission
Simulating Cosmic Reionization
The Cosmic Dark Ages and the Epoch of Reionization constitute a crucial missing link in our understanding of the evolution of the intergalactic medium and the formation and evolution of galaxies. Due
Luminosity Bias. II. The Cosmic Web of the First Stars
  • R. Barkana
  • Physics
    Publications of the Astronomical Society of Australia
  • 2013
Abstract Understanding the formation and evolution of the first stars and galaxies represents one of the most exciting frontiers in astronomy. Since the universe was filled with neutral hydrogen at
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Early reionization by the first galaxies
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The high ionization level and nonzero metallicity (~1% Z☉) of the intergalactic gas at redshifts z 5 implies that nonlinear structure had started to form in the universe at earlier times than we
Reionization during hierarchical clustering in a universe dominated by cold dark matter
We investigate reheating of the universe by early formation of stars and quasars in the hierarchical clustering scheme of cold dark matter scenario, with perturbation fluctuations normalized by the
Destruction of Molecular Hydrogen during Cosmological Reionization
We investigate the ability of primordial gas clouds to retain molecular hydrogen (H2) during the initial phase of the reionization epoch. We find that before the Str?mgren spheres of the individual
We show that various milestones of high-redshift galaxy formation, such as the formation of the first stars or the complete reionization of the intergalactic medium, occurred at different times in
We investigate the 21 cm signature that may arise from the intergalactic medium (IGM) prior to the epoch of full reionization (z > 5). In scenarios in which the IGM is reionized by discrete sources
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The minimum mass that a virialized gas cloud must have in order to be able to cool in a Hubble time is computed, using a detailed treatment of the chemistry of molecular hydrogen. With a simple model
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This work calculates the evolution of the spin temperature for this transition and the resulting anisotropies that are imprinted on the CMB sky due to linear density fluctuations during this epoch.
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