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The ultra-bright galaxies of the early universe are perhaps less common than previously thought, according to a study done with the Hubble Space Telescope.
Researchers at the University of Melbourne in Australia have used two galaxies to be so far away that we see them over 13 billion years ago when the universe was young.
Published in the Astrophysical Journal Letters, the study revealed that a galaxy was a light source seen over 13 billion years ago, as
However, the other was an "impostor" – a relatively close galaxy taken for a very distant because of its red color.
The effect known as redshift gives distant galaxies distinct colors that may indicate how far away they are.
However, some relatively close galaxies have falsely similar colors, which confers some uncertainty on their estimated distance.
The researchers said this discovery – that the brightest known galaxy candidate in the primitive universe is essentially a fraud – has profound implications for models of galaxy formation when the universe was at its debut.
Associate Professor Michele Trenti of the University of Melbourne said that while another camera was being used, the team He used the Wide Field Camera 3 camera, very sensitive, to observe a Random area of the sky for a few hours.
He said that repeat more than 100 times a rich set of data covering independent parts of the universe, maximizing the chances of landing. "Given that Hubble's primary time is so rare and oversubscribed, the BoRG study represents an ideal opportunity to carry out advanced science at no additional cost," said Trenti
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(This story was not edited by Devdiscourse staff and is generated automatically from a syndicated feed.)
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