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Supernovae Made Way for Cosmic Reionization

19 May 2017, 15:09 UTC
Supernovae Made Way for Cosmic Reionization
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Title: Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies
Authors: Maxime Trebitsch, Jérémy Blaizot, Joakim Rosdahl, Julien Devriendt and Adrianne SlyzFirst Author’s Institution: Sorbonne Universités, UPMC Univ Paris 6 et CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis bd Arago, 75014 Paris, FranceStatus: Accepted to the Monthly Notices of the Royal Astronomical Society, open access
The epoch of reionization may not be a familiar time period to all, but it gave rise to the luxury we have to be able to see galaxies, stars, and planets far far away! Let’s have a one-minute review on cosmic history. As the Universe expanded after the Big Bang, the hot dense soup of energetic particles cooled down. After about 380,000 years, it cooled down enough where free electrons and protons could find each other and reunite into neutral hydrogen (it did happen, we took pictures!) Hydrogen atoms are extremely good at blocking light. If the Universe stayed neutral, we wouldn’t be able to see so far. So something must have managed to ionize these neutral hydrogen atoms back again for the second time since the first ionization during the Big Bang. Indeed we call the time before such ...

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