Disk galaxies became elliptical due to the formation of stars at their centers.
Scientists from Japan found that not all of the current galaxy was formed as a result of the merger.
Some disk galaxies became elliptical due to the formation of stars at their centers.
In 1926, the famous astronomer Edwin Hubble developed his morphological classification scheme of galaxies. This method divided the galaxy into three main groups – elliptical, spiral and lenticular – depending on their shape. Since then, astronomers have devoted a lot of time and effort in trying to determine how galaxies have evolved over billions of years to acquire these forms.
Previously it was assumed that the galaxy has changed shape due to the merger. However, a new study has shown that galaxies could receive a modern shape due to the formation of new stars in their centers.
Scientists led by the National astronomical Observatory of Japan Kenichi an Imperial official conducted a series of observations of very distant galaxies. The study included the use of multiple telescopes, which astronomers have observed 25 galaxies located at a distance of about 11 billion light years from Earth. Observations were made using the 8.2 meter Subaru telescope (Hawaii) space telescope NASA Hubble telescope and the Atacama Large Millimeter/submillimeter Array (ALMA, Chile).
“It was believed that massive elliptical galaxies formed as a result of collisions of galactic disks. However, we do not believe that all elliptical galaxies were once affected by this intergalactic event. We believe that there is an alternative. We received strong evidence that dense galactic nuclei can be formed without colliding galaxies. They can also be formed by intense of star formation in the center of the galaxy,” said an Imperial official.
The results of this study may force astronomers to review current models and theories of galactic evolution. The study also may lead to a revision of the cosmological models of evolution.