The galactic stellar nucleation by globular cluster interactions in dwarf galaxies

TL;DR

This paper investigates how globular clusters in dwarf galaxies can survive long-term by analyzing the impact of cored dark matter halos on dynamical friction through N-body simulations.

Contribution

It provides a simulation-based explanation for the suppression of dynamical friction in dwarf galaxies with cored dark matter halos.

Findings

Dynamical friction is significantly weakened in cored dark matter halos.

Globular clusters can persist in dwarf galaxies without falling into the center.

N-body simulations support the hypothesis of core-induced friction suppression.

Abstract

Dinamical Friction Problem is a long-standing dilemma about globular clusters(hereafter,GCs) belonging to dwarf galaxies. The GCs are strongly affected by dynamical friction in dwarf galaxies, and presumed to fall into the galactic center. But GCs do exist in dwarf galaxies. Recentry, a new solution was proposed. If dwarf galaxies have a cored dark matter halo, in which case the effect of dynamical friction will be weaken considerably, and GCs are able to survive beyond the age of the universe. In this study, we discussed why does a constant density cored halo cease dynamical friction, by means of N-body simulations.