# Dynamics of dwarf galaxies disfavor stellar-mass black hole dark matter

## TL;DR

This study investigates how stellar-mass black hole dark matter influences dwarf galaxy dynamics, revealing that current observations strongly limit the fraction of dark matter that can be composed of such black holes.

## Contribution

It provides new constraints on black hole dark matter in dwarf galaxies by analyzing stellar surface density profiles and mass segregation effects.

## Key findings

- Mass segregation causes stellar depletion in dwarf galaxy centers.
- A ring structure appears in the stellar surface density profile.
- Black holes exceeding 6% of dark matter are ruled out at 99.9% confidence.

## Abstract

We study the effects of black hole dark matter on the dynamical evolution of stars in dwarf galaxies. We find that mass segregation leads to a depletion of stars in the center of dwarf galaxies and the appearance of a ring in the projected stellar surface density profile. Using Segue 1 as an example we show that current observations of the projected surface stellar density rule out at the 99.9% confidence level the possibility that more than 6% of the dark matter is composed of black holes with a mass of few tens of solar masses.