Unified description of dark matter at the center and in the halo of the Galaxy

TL;DR

This paper models the Galactic dark matter halo and central compact object using a self-gravitating ideal fermion gas at nonzero temperature, providing a unified description of dark matter distribution.

Contribution

It introduces a self-consistent fermion gas model that explains both the Galactic halo and central supermassive object in thermal and hydrostatic equilibrium.

Findings

The halo mass is approximately 2 x 10^12 solar masses within 200 kpc.

The central object has a maximal mass of about 2.3 million solar masses.

The minimal radius of the central object is around 18 milliparsecs for 15 keV fermions.

Abstract

We consider a self-gravitating ideal fermion gas at nonzero temperature as a model for the Galactic halo. The Galactic halo of mass ~ 2 x 10^12 Msol enclosed within a radius of ~ 200 kpc implies the existence of a supermassive compact dark object at the Galactic center that is in hydrostatic and thermal equilibrium with the halo. The central object has a maximal mass of ~ 2.3 x 10^6 Msol within a minimal radius of ~ 18 mpc for fermin masses ~ 15 keV.