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ALEXANDRA ANGELICH, NRAO / AUI / NSF / SCIENCE PHOTO LIBRARY ALEXANDRA ANGELICH, NRAO / AUI / NSF / SCIENCE PHOTO LIBRARY
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High-redshift galaxy, illustration. Progenitor of a Milky Way-like galaxy in the early universe with a background quasar shinning through a 'super halo' of hydrogen gas surrounding the galaxy. ALMA (Atacama Large Millimeter Array) observations of two such galaxies (each around 12 billion light years from Earth) revealed that these vast halos extend well beyond the galaxies' dusty, star-forming disks. The galaxies were initially found by the absorption of background quasar light passing through the galaxies. ALMA was able to image the ionized carbon in the galaxies' disks, revealing crucial details about their structures. The results of the observations were published in 2017.
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