Galactic structure explained with dissipative mirror dark matter

TL;DR

This paper models dissipative mirror dark matter in spiral galaxies, deriving equations for halo heating and cooling, and finds results consistent with observed galactic scaling relations.

Contribution

It provides a detailed theoretical framework linking supernova energy transfer to dark matter halo properties, supporting observed galactic scaling relations.

Findings

Derived equations for halo heating and cooling.

Numerical solutions match observed scaling relations.

Constraints on dark matter parameters align with observations.

Abstract

Dissipative dark matter, such as mirror dark matter and related hidden sector dark matter candidates, requires an energy source to stabilize dark matter halos in spiral galaxies. It has been proposed previously that supernovae could be the source of this energy. Recently, it has been argued that this mechanism might explain two galactic scaling relations inferred from observations of spiral galaxies. One of which is that $\rho_0 r_0$ is roughly constant, and another relates the galactic luminosity to $r_0$. [$\rho_0$ is the dark matter central density and $r_0$ is the core radius.] Here we derive equations for the heating of the halo via supernova energy, and the cooling of the halo via thermal bremsstrahlung. These equations are numerically solved to obtain constraints on the $\rho_0, \ r_0$ parameters appropriate for spiral galaxies. These constraints are in remarkable agreement with the aforementioned scaling relations.