Scientists Try to Find the Link Between Dark Matter and Galaxy Formation


Just as stars have planets and moons of planets, our galaxy has satellite galaxies. Some of these may have their own satellite galaxies. That is, according to ESA’s Gaia mission data, the Large Magellanic Cloud (LMC), a relatively large satellite galaxy visible from the Southern Hemisphere, is thought to bring at least six of its satellite galaxies when it first approaches the Milky Way.

Astrophysicists believe dark matter is responsible for most satellite galaxies. Scientists at the SLAC National Accelerator Lab and Dark Energy Survey (DES) have used observations of weak galaxies around the Milky Way to put tighter restrictions on the connection between the size and structure of the galaxies and the dark matter surrounding them.

At the same time, researchers who found more evidence for the presence of LMC satellite galaxies made a new prediction. If the scientists’ models are correct, the Milky Way must have 150 or more faint satellite galaxies waiting to be explored with next-generation projects such as the Vera C. Rubin Observatory.

Dark matter study from scientists:
Ethan Nadler from the Kavli Particle Institute of Astrophysics and Cosmology (KIPAC) interpreted the study as a good opportunity to understand how dark matter works at smaller scales than our galaxy. Nadler also said, “We know very well about dark matter. How dark is there, how is it clustered? ” said.

KIPAC Director Risa Wechsler said that for the first time they were able to look at satellite galaxies in about three quarters of the sky. Wechsler noted that this opportunity is extremely important for various learning methods about dark matter and galaxy formation.

Wechsler, Nadler and the DES team said, “How much dark matter is required to create a galaxy? How many satellite galaxies should we expect to find around the Milky Way? Can galaxies orbit their satellites in orbit around us? ”

In addition to the LMC findings, the team also limited the link between dark matter and galaxy structure. Researchers doing simulations think there are about 100 more satellite galaxies orbiting the Milky Way if the output is correct. It is stated that the discovery of these galaxies will help researchers verify the link model between dark matter and galaxy formation.


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