A team led by Spanish researchers from the Centro de Astrobiología (CAB and CSIC-INTA) and the Instituto de Astrofísica de Canarias (IAC) was able to determine that galaxies They have Source s structures Different.
The origin of galaxies are two different waves
By observing a section of deep space located in the constellation Ursa Major, scientists from around the world were able to establish a timeline for the first structures formed in the universe.
The results of this study, published in The Astrophysical Journal, represent a major step toward learning how galaxies such as the Milky Way are formed.
Gran Telescopio Canarias (GTC), the world’s largest optical and infrared telescope, helped study. It consisted in analyzing disk images and spherical galaxies (without a disk), located in a region of the deep sky.
According to the report of the Astronomical Institute of the Canary Islands, the great discovery is the asymmetric composition between galaxies disc. They had very different rhythms, something that doesn’t have an exact explanation yet.
One third galaxies The discs formed when the universe was only 5% of its current age, about 900 million years ago. While the remaining two-thirds had Source More recently, about four billion years ago or roughly 35% of the age of the universe.
In addition to being of different ages, these galaxies grew at rates Source A very different star.
“We’ve found that the universe has two ways of forming the central part of galaxies like ours: starting early and erupting, or taking time to start and end also forming a large number of stars in what’s known as a bulge.Pablo J. Perez-Gonzalez, CAB Researcher and Principal Investigator of the SHARDS Project.
The different rhythm in the formation of galaxies
Stars galaxies The oldest formed quickly, on time scales of 200 million years. But the second wave of galaxies The universe, in which the rate of star formation was five times its length, that is, a billion years.
Paula Dimauro, a researcher at the National Observatory of Brazil and co-author of the work, explained this phenomenon with a curious example, comparing between Source subordinate galaxies With the establishment and development of a great city over the centuries.
“Thus, just as some large cities have been observed to have an older historic center housing the oldest buildings in narrow and varied streets, the results of this work indicate that some disc galactic centers in fact host some of the oldest spheroids ever formed in the universe, which have acquired new disks to form Materials, new oceanic life, slower. Dimauro explains.
The result reveals, galaxies they have one structure what or what It did not appear at the same time, or in the same way, and what we know about it Source It has become more complex.
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