This hypothesis explains not only the differences in the behavior of the nuclei of different galaxies, but also the formation itself.
Modern cosmological theories suggestthat the center of the Milky Way is occupied by a supermassive black hole called Sagittarius A *. But scientists did not have the opportunity to directly observe it, because the center of our galaxy is a particularly turbulent place.
Sagittarius A * actually stands for powerfula radio source that was captured by very long baseline interferometry. Observations of the stars closest to the region, such as S2, have calculated the mass and outer boundaries of this object (its diameter is about 60 million kilometers) and confirmed that it is supermassive, but clouds of dust and gas interfere with direct observation.
The only ones we know of todayobjects capable of reaching this size and mass are black holes. The new study analyzed the orbits and velocities of the closest objects to Sagittarius A *, and came to an interesting conclusion: what's at the center of our galaxy is not a black hole, but a core of dark matter.
What exactly is the core of dark matter, answerdifficult, because it is not completely known what dark matter is. It is estimated to make up 80% of the matter in the universe, and its presence helps explain gravitational phenomena for which there is no other explanation.
X-rays coming from SagittariusA * showed that the supposed black hole had swallowed two objects. The movement of these objects made it clear that they experienced some resistance or friction when approaching Sagittarius A *, which is completely unusual for a black hole.
A group of astrophysicists led by the CenterItalian relativistic astrophysics, led by Edouard Antonio Becerra-Vergara, began studying 17 other S-stars that swarm in the region. Their calculations showed that the velocities and orbits of these stars are not completely consistent with the presence of a black hole. Rather, we are talking about a supermassive cluster of dark matter, the edges of which are blurred.
Such a cluster or core of dark matterhas such a great gravitational attraction that it accumulates matter like a black hole, but its mass is not large enough to collapse into one of these singularities.
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