Astronomers looking to pinpoint when the reionozation of the Universe took place have found some of the earliest galaxies about 800 million years after the Big Bang. 22 early galaxies were found using a method that looks for far-away redshifting sources that disappear or "drop-out" at a specific wavelength. The age of one galaxy was confirmed by a characteristic neutral hydrogen signature at 787 million years after the Big Bang. The finding is the first age-confirmation of a so-called dropout galaxy at that distant time and pinpoints when the reionization epoch likely began.
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Read the rest of Early Galaxy Pinpoints Reionization Era (532 words)
© nancy for Universe Today, 2009. |
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Full story at http://www.universetoday.com/2009/11/06/early-galaxy-pinpoints-reionization-era/
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