The motion of stars near the Galactic center: A comparison of the black hole and fermion ball scenarios

Abstract

After a discussion of the properties of degenerate fermion balls, we analyze the orbits of the stars S0-1 and S0-2, which have the smallest projected distances to Sgr A*, in the supermassive black hole as well as in the fermion ball scenarios of the Galactic center. It is shown that both scenarios are consistent with the data, as measured during the last six years by Genzel et al. and Ghez et al. The free parameters of the projected orbit of a star are the unknown components of its velocity v_z and distance z to Sgr A* in 1995.4, with the z-axis being in the line of sight. We show, in the case of S0-1 and S0-2, that the z-v_z phase-space which fits the data, is much larger for the fermion ball than for the black hole scenario. Future measurements of the positions or radial velocities of S0-1 and S0-2 could reduce this allowed phase-space and eventually rule out one of the currently acceptable scenarios. This may shed some light into the nature of the supermassive compact dark object, or dark matter in general at the center of our Galaxy.

30 pages, 12 figures, Latex, aasms4 style

References in corpus (1)

• On the Formation of Degenerate Heavy Neutrino Stars

Cited by in corpus (22)

• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• Stellar Orbits Around the Galactic Center Black Hole
• Stellar dynamics in the central arcsecond of our galaxy
• Stellar Processes Near the Massive Black Hole in the Galactic Center
• The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole
• Scalar field effects on the orbit of S2 star
• Is there a Supermassive Black Hole at the Center of the Milky Way?
• Full Three Dimensional Orbits For Multiple Stars on Close Approaches to the Central Supermassive Black Hole
• Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars
• Weighing the cusp at the Galactic Centre
• Fast Growth of Supermassive Black Holes in Galaxies
• The Galactic Center as a laboratory for theories of gravity and dark matter
• Constraints on Yukawa gravity parameters from observations of bright stars
• The black hole at the Galactic Center: observations and models
• Degenerate sterile neutrino dark matter in the cores of galaxies
• The Galactic Center stellar cluster: The central arcsecond
• Boson-fermion stars: exploring different configurations
• An independent hybrid imaging of Sgr A* from the data in EHT 2017 observations
• Degenerate Fermi gas perturbations at standard background cosmology
• Decaying Sterile Neutrinos as a Heating Source in the Milky Way Center
• The Existence of Sterile Neutrino Halos in Galactic Centers as an Explanation of the Black Hole mass - Velocity Dispersion Relation
• Holes within galaxies: the egg or the hen?