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The extremely red objects (EROs) refer to one kind of galaxies selected by using the color indices in optical and near-infrared wavebands (such as I−K>4 mag). The studies indicate that the EROs are comprised of two classes: one stands for the dust-reddened star-forming galaxies with high redshifts, which are reddened by a large amount of dust, they are mainly the younger spiral galaxies and irregular...
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