Abstract:

Observations of the trajectories of bright stars in the vicinity of the Galactic Center have shown that there is a compact distribution of matter, which is interpreted as a supermassive black hole with a mass of the order of M ≈ 4.3*10⁶ M_sun. In 2015, Ruffini, Arguelles, Rueda (RAR) proposed a model for the distribution of dark matter with a dense core and a diluted halo, while in the Galactic Center there is not a supermassive black hole, but a core of dark matter with constant density. In 2020-2021, claims were made that the RAR model could better fit the trajectories of bright stars than the traditional model involving a supermassive black hole. The RAR-model was actively promoted instead of the supermassive black hole at the Galactic Center, see https://www.popularmechanics.com/space/deep-space/a36530817/the-center-of-the-milky-way-might-not-be-a-black-hole-after-all/ and https://www.icranet.org/index.php?option=com_content&task=view&id=1379.

In our work, we showed that the trajectories of stars considered in the framework of the RAR model are elliptical, but the properties of these trajectories are different from those observed and the traditional model of the Galactic Center, which includes the supermassive black hole, is preferable.

Reference

A.F. Zakharov, arXiv:2108.09709;
MNRAS Letters, https://doi.org/10.1093/mnrasl/slab111