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How did the astronomers know it was a lensed object?

April 26, 2017astronomers lensed object

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How did the astronomers know it was a lensed object?

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10 Posted

A telltale sign of the lensing is the fact the remote galaxy’s image is smeared into an arc-shape by the gravitational influence of the intervening galaxy cluster. The smeared image of the galaxy stood out because of its unusual reddish color, never observed in such galaxies before.