Astronomers have discovered some surprisingly about the smallest and unconscious class of the universe of the galaxies: Ultra-Difference Galaxy (UDG).
A research team studying these galaxies found that about half of them showed signs of speed, which defines previous principles about the formation and development of such places. In particular, the team found an unexpected rotational motion of stars within many of these dwarf galaxies.
Scientists reached these conclusions while studying steller motion 30 Udgs in the Hydra Galaxy cluster are located more than 160 million from us more than 160 million. Conclusions can change our understanding of how UDGs are formed and develop.
“The results we achieved were double satisfactory,” the National Institute for Astrophysics and a paper co-author Chira Buttta said on these results. “Not only did we be able to reduce the stellar movements in these extremely unconscious galaxies, but we found something that we did not expect to see.”
The team “see in unconsciousness with the museum” or Lewis, the observation program, installed on the very large telescope (VLT), which is powered by the Integral Field spectrograph. VLT is the most advanced visible visible astronomical observatory in the world, and is located in Chile.
Fine galaxies origin
UDG was first discovered in 2015; The formation and development of these ultrafant, strange long galaxies immediately presented a puzzle for astronomers.
Lewis’s findings allowed the new study team to determine that the UDGs live in the atmosphere which are very different in the context of their physical properties, including the amount of dark matter and the movements and compositions of their stars.
In particular, scientists were able to conduct a detailed investigation of the UDG named “UDG32”. This dwarf galaxy is located at the end of the tail of a filament of gas associated with the galaxy spiral galaxy, dubbed “NGC 3314 A”.
A possible theory about the formation of UDG suggests that they are formed when gas filaments are drawn from large galaxies through gravity interactions.
If gas clouds remain in these filaments, these clouds can become very dense and collapse, which can form stars that become the foundation of UDG.
Lewis data confirmed that the Association of UDG32 with the filament tail of NGC3314A is not the result of a coincidental alignment. There is something else that appears to UDG32 located at tidal tip of NGC3314A.
Additionally, UDG32 is more rich in heavier elements than hydrogen and helium, which astronomers have collectively called “metal” in the Hydra cluster compared to other UDGs.
Atomic processes in the hearts of metals make metals forged and when these stars explode at the end of their life, the formation sections of the next generation are formed.
This is interesting, because despite the stars in UDG32, other hydra clusters are smaller than stars in UDGS, they are rich in metals. This suggests that they were shed pre-metal-rich gas and dust by a large and more ancient galaxy, supporting the idea that this UDG was dragged by his spiral galaxy neighbor.
The team’s results are significant verification for the Lewis project, thus double the number of UDGs, which have been analyzed spectroscopically. Additionally, Lewis has provided the first “global” view of these unconscious galaxies within a galaxy cluster that is still being formed.
Louis’s scientific director, Entericheta Iodice said, “The Lewis Project was a challenge. When the program was accepted by the ESO, we realized that it was a gold mine of data to find out. And that is what it has come out,” said the scientific director of Lewis, Enrica Iodis.
“Lewis’s ‘strength’, thanks to the integral spectroscopy of the used tools, is located in being able to study together for each individual galaxy, not only the stars, but also the average steller population,” Iodis said, “and therefore, there are signs for the age and the properties of the formation of the formation.
“By placing personal results together like a puzzle, we re -organize the formation of these systems.”
The team’s research was expanded in two letters published in the magazine, Astronomy and Astrophysics.
