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The pseudo -color image of Galaxy FCC 224 is the most behavioral, as it was taken by the Hubble Space Telescope. | Credit: NASA/STCI
Astronomers have fallen into another galaxy that seems free of dark matter.
Dark material, Unimplemented astronomers believe to dominate universeProvides gravitational scaffolding Galaxies To collect and grow. The discovery of a galaxy without a dark matter is already confusing, such as finding a shadow without a source.
However, during the past decade, numerous Such scenes It was reported All of them are called “ultradifuse”, which are about our size milky way But significantly in the stars.
The newest member of this confusing group, known as FCC 224, resides on the sidelines of the Fornax Group, a group of galaxies that are nearly 65 million light years of Earth.
Related to: What is the dark matter?
Firstly It was monitored in 2024FCC 224 is a dwarf galaxy that includes tens of sets of luminous luminous stars tightly-which is an unusually rich collection of its size, and is usually seen in larger galaxies rich in dark shades-and however it seems to lack the mysterious material. It also occupies a clearly different cosmic living from other galaxies that suffer from a shortage of dark matter, indicating that such things may not be isolated, but rather represent a more common category that is not recognized by dwarf galaxies, according to two timing two supplements published last month.
“No model exists to form a galaxy in our standard cosmic model can currently explain how this galaxy has become,” Maria Bazu, PhD candidate in astronomical physics at Swinburn University of Technology in Australia that led One of the new studiesHe said in a statement.
Using data from the KECK Observatory in Hawaii, followed by Buzzo and its team, dozens of star groups within FCC 224. These measurements have revealed a slow speed between groups, which is a major indication that the galaxy lacks the strong clouds of the dark matter, according to the new study reports. No known scenario can explain FCC 224 characteristics, the researchers say.
Another team, led by the astronomer Yimeng Tang at the University of California, Santa Cruz, compared the FCC 224 properties to other galaxies that seem to lack the dark matter, with a focus on it Ghost creatures Within the NGC 1052 group, about 65 million light -years in the CETUS constellation.
Tang and his colleagues suggest that FCC 224, such as NGC 1052 DWARF galaxies, formed from a high -speed collision of gas -rich galaxies. In such an event, the gas is separated from the dark matter, and the formation of subsequent stars in the embroidered gas is galaxies without darkness or more.
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former research I found that the two galaxies in the NGC 1052, DF2 and DF4 collection, belonging to a seven to 11 galaxies that suffer from a lack of darkness formed in the same old collision. FCC is likely to have a double galaxy, too, Tang and his team suggest Ticket.
One of the candidates is the near Galaxy FCC 240, which appears to have the same size, shape and orientation like FCC 224. If the upcoming notes confirmed common characteristics, it will provide decisive evidence that supports the collision scenario for FCC 224, the researchers say.
Instead, FCC can be 224 as a result of a high -energy chaotic environment where condensed star The team indicates that the training is one of the excessive stars groups that expelled the dark matter from the galaxy.
“FCC 224 is a decisive data point in our efforts to determine and study other galaxies that suffer from dark deficiency,” Buzzo said in the statement. “By expanding the size of the sample, we can improve our understanding of these rare galaxies and the role of the dark matter in the formation of the dwarf galaxy.”
