Hubble observations challenge supernova winds' role in cosmic reionization
An international team of researchers, including members from the University of Michigan, has revealed surprising results that could rewrite our understanding of a key transition in the early universe.
An international team of researchers has challenged the conventional explanation for the process that transformed the early universe from a neutral, opaque hydrogen fog to the ionized, transparent cosmos we observe today. Led by Cody Carr, a University of Michigan postdoctoral researcher, the team used the Hubble Space Telescope to observe nearby starburst galaxies and found that galaxies with faster galactic winds actually let in less ionizing radiation, contradicting the prevailing theory that supernova winds are responsible for enabling this radiation to escape.
Carr's study, published in Nature Astronomy, suggests young stellar activity likely played a more significant role in the initial stages of reionization, before supernova-driven winds became dominant.
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