An international research team has studied the galaxy MACS1149-JD1: its disk rotates at a speed of about 50
The formation of galaxies begins with the accumulationgas and continues with the formation of stars from this gas, astrophysicists explain. Star formation spreads from the center to the edges, the galactic disk gradually forms, and the galaxy takes on a special shape. As star formation proceeds, new stars form in the rotating disk, while old stars remain in the central region. By studying the age of stellar objects and the motion of stars and gas, one can determine the evolutionary stage of a galaxy.
MACS1149-JD1 is one of the most distant from Earthknown galaxies. Based on redshift analysis, researchers estimate its distance at 13.3 billion light-years, or about 500 million years after the Big Bang. According to the researchers, this galaxy is the earliest known to date, in which the rotation of the stellar disk was discovered.
The researchers say that the mass of JD1, estimatedbased on rotational speed, corresponds to a galaxy composed of "mature" stars that formed about 300 million years ago. This means that most of the star formation processes in the galaxy occurred in the first few hundred million years after the Big Bang.
Astrophysicists plan to study thisgalaxy with the help of the James Webb telescope, which will begin scientific work in the near future. Scientists will try to accurately determine the location of young and old stars in the galaxy in order to clarify the process of its formation.
Cover image: ALMA (ESO/NAOJ/NRAO)
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