Sunday , August 1 2021

Baby stars can shake strange things around the dwarf galaxies • The registry

Dark matter can be even more elusive than previously thought, as researchers believe that the mysterious material hidden in the heart of the galaxies can be shifted to the power of heat.

The process described as "dark matter darkness" occurs in dwarf galaxies, which are often floating around larger galaxies like the Milky Way. A group of international astrophysicists from the University of Surrey, Carnegie Mellon University and ETH Zurich have studied 16 dwarf galaxies divided into two forms: irregular, amorphous and similar as those spheroids. They were all at different stages of evolution, and the researchers estimated the amount of dark matter contained in each of them.

They found that older galaxies with slower star formation rates had stronger nuclei of dark matter than the younger galaxies. Galaxies older than six billion years ago had more than a staggering 100 million solar masses of dark matter in their core, while those younger than three billion years ago had "shallower" dark matter. The results were announced yesterday in the Monthly notifications of the Royal Astronomical Society.

The researchers believe that the abundant amounts of energy emitted by the growing stars heat the center of the galaxy and push the dark matter. As the stars form, the strong rays of electromagnetic radiation accelerate the gas and dust, leaving the cores with a smaller mass. Reduction means that there is less gravitational attraction, and the dark matter gets enough energy to distance itself from the center of the galaxy.

"We found a remarkable relationship between the amount of dark matter in the centers of these small dwarfs and the amount of star they experienced throughout their lives," said Justin Read, the study's principal author and professor of physics at the University of Surrey. "The dark matter in the centers of dwarf stars that form the stars appear to be" warmed up and pushed. "

Dark matter accounts for about 27 percent of the universe, and although it is richer than visible baryon, it has yet to be directly detected. It does not connect to light but is influenced by gravity. The dynamic nature of the material made the researchers believe that dark matter was, in fact, "cold, uncontrollable, fluid that could be kinetic" warmed "and moved around." ®

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