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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 .
University researchers from Melbourne Australia used Hubble to observe two galaxies considered so distant that we see them over 13 billion years in the time when the universe was young.
Published in the Astrophysical Journal Letters, the study revealed that a galaxy was a brilliant source seen over 13 billion years ago, as expected
however , the other was an "impostor" – a relatively close galaxy taken for a very distant one due to its red color.
The effect known as redshift gives distant galaxies distinct colors that can indicate how far away they are.
However, some relatively close galaxies have falsely similar colors,
The researchers said that this discovery – that the brightest candidate known to the galaxy in the primitive universe is essentially a fraud – has implications deep on galaxy formation patterns when the universe was in its infancy. Michele Trenti of the University of Melbourne said that while another camera was being used, the team used the highly sensitive Wide Field Camera 3 camera to observe a random area of the sky during a few hours.
He said that repeating this more than 100 times accumulated a rich data set that covered independent parts of the universe, maximizing the chances of landing a rare and bright young galaxy.
"Since the Hubble primary time is so rare and oversubscribed, the BoRG survey represents an ideal opportunity to carry out advanced science at no additional cost," said Trenti.
"He is doubling the productivity of an already amazing telescope". has not been changed by Business Standard staff and is generated automatically from a syndicated feed.)
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