'Submillimeter galaxy' observed 12.4 billion light-years away
Washington, June 22 (ANI): Using ALMA (Atacama Large Millimeter/submillimeter Array), an international research team has observed a "submillimeter galaxy" located about 12.4 billion light-years away and has successfully detected an emission line from nitrogen contained in that galaxy.
Associate Professor Tohru Nagao from Kyoto University led the research team that included researchers from Japan and Europe.
Comparisons between the data obtained by ALMA and numerical models revealed that the elemental composition of this galaxy in the early universe, at only 1.3 billion years after the Big Bang, was already close to the elemental composition of the present universe.
This result suggested that intense star formation activities had occurred in the early universe.
A submillimeter galaxy is a type of galaxy, which has intense star formation activity and is covered by large amounts of dust that block visible light.
This situation hampers detailed observation of the galaxy with optical telescopes, such as the Subaru Telescope. ALMA observes celestial objects at millimeter wavelength, which penetrates though dust clouds.
In addition, ALMA also has extraordinary sensitivity, which is capable of catching even extremely faint radio signals. This is the result with one of the most distant galaxies ALMA has ever observed. (ANI)
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