Photo: NRAO / AUI / NSF / S. Dagnello
Scientists at the Institute of astronomy of max Planck Society in the UK announced the discovery of the most ancient massive galaxy DLA0817g, which appeared only 1.5 billion years after the Big Bang. She has the disk that can change the view of astronomers about the formation mechanisms of galaxies. Article astronomers published in the journal Nature.
The researchers found the galaxy using a set of radio telescopes ALMA (Atacama Large Millimeter Array). This ancient object was named Disc of the wolf — in honor of astronomer Arthur Wolfe. It became the most distant galaxy with a rotating disk among all detected at the moment, and its cosmological redshift is 4.26. The light flew 12.2 billion years, but due to the expansion of the Universe galaxy is currently at a distance of 24.4 billion light-years. The rotation occurs at a speed of 272 kilometers per second, which is comparable to the speed of rotation of the milky Way.
According to modern models, massive galaxies are formed from mergers of smaller-mass galaxies and clusters of hot gas. These collisions hinder the formation of the disks, characteristic for the present Universe age. Therefore, the existence of Disk wolf will force astronomers to revise the mechanisms for the appearance of such space objects. Probably DLA0817g accumulated cold gas, but the question of how he managed to keep a stable disc with such a large mass remains open.
The researchers also found that the rate of star formation in the Disk of the wolf ten times the speed of star formation in the milky Way. According to astronomers, it was one of the most productive galaxies in the early Universe.
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