Study Suggests Dark Matter Core May Influence Milky Way's Center
New research proposes that a dense dark matter core, rather than a supermassive black hole, could be governing the dynamics at the Milky Way's center.
Recent research challenges the prevailing belief that Sagittarius A*, the supermassive black hole at the Milky Way's center, is the primary influence on nearby stellar orbits. Instead, scientists suggest that a dense core of dark matter—a form of matter that does not emit light and is detectable only through its gravitational effects—could be responsible for the observed motions of stars in this region.
The study, published in the Monthly Notices of the Royal Astronomical Society, presents simulations indicating that such a dark matter core could replicate the gravitational pull attributed to Sagittarius A*. This model aligns with certain unexplained observations of the Galactic Center, including the behavior of S-stars, a group of fast-moving stars near the core.
"This is the first time a dark matter model has successfully bridged these vastly different scales and various object orbits," said Carlos Argüelles, co-author and astrophysicist at the Institute of Astrophysics La Plata in Argentina.
While black holes and dark matter share the characteristic of being invisible, their existence is inferred through their gravitational interactions with visible matter. Unlike black holes, which have been directly observed, dark matter remains elusive, though it is believed to constitute approximately 85% of the universe's mass.
The researchers acknowledge that their dark matter model is not conclusively superior to the black hole model but offers a compelling alternative that warrants further investigation. They anticipate that data from next-generation instruments will provide additional insights into the nature of the Milky Way's core.