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study galaxies that are common but faint,
as well as those that are bright but rare,
at this early stage in the universe,” said
astronomer Sangeeta Malhotra.
The DECam is installed at the National Optical Astronomy Observatory
(NOAO)’s 4-m Blanco Telescope, located
at the Cerro Tololo Inter-American Observatory (CTIO) in northern Chile, at an
altitude of 7200 feet.
“Our findings in this survey imply
that a large fraction of the first galaxies
that ionized and illuminated the universe
formed early, less than 800 million years
after the Big Bang,” said astronomer
Building on these results, the team
plans to continue to search for star-forming galaxies over a larger volume of
the universe and to further investigate the
nature of some of the first galaxies in the
The research was published in The
Astrophysical Journal Letters (doi:
False color image of a 2-square-degree region of the LAGER survey field, created from images taken in the
optical at 500 nm (blue), in the NIR at 920 nm (red), and in a narrow-band filter centered at 964 nm (green).
The small white boxes indicate the positions of the 23 Lyman-alpha emitters (LAEs) discovered in the survey.
The detailed insets (yellow) show two of the brightest LAEs.