Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang

@article{Tilvi2020OnsetOC,
  title={Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang},
  author={Vithal S. Tilvi and Sangeeta Malhotra and James E. Rhoads and Alicia Coughlin and Z. Zheng and Steven L. Finkelstein and Sylvain Veilleux and Bahram Mobasher and J. X. Wang and Ronald George Probst and Rob Swaters and Pascale Hibon and Bhavin A. Joshi and Johannes Zabl and T. Jiang and John Pharo and H. Yang},
  journal={The Astrophysical Journal Letters},
  year={2020},
  volume={891}
}
While most of the intergalactic medium (IGM) today is permeated by ionized hydrogen, it was largely filled with neutral hydrogen for the first 700 million years after the big bang. The process that ionized the IGM (cosmic reionization) is expected to be spatially inhomogeneous, with fainter galaxies likely playing a significant role. However, we still have only a few direct constraints on the reionization process. Here we report spectroscopic confirmation of two galaxies and very likely a third… 

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