On the isolated dwarf galaxies: from cuspy to flat dark matter density profiles and metallicity gradients

TL;DR

This study shows that star formation naturally transforms cuspy dark matter profiles into flatter ones in isolated dwarf galaxies, aligning observations with cosmological predictions, and also explores their chemical evolution.

Contribution

It demonstrates that star formation alone can flatten dark matter profiles in dwarf galaxies without special tuning, reconciling observations with cosmological models.

Findings

Dark matter profiles flatten over time due to star formation.

Flattened profiles are consistent with many observed dwarf galaxies.

Chemical evolution models match observational data.

Abstract

The chemodynamical evolution of spherical multi-component self-gravitating models for isolated dwarf galaxies is studied. We compare their evolution with and without feedback effects from star formation processes. We find that initially cuspy dark matter profiles flatten with time as a result of star formation, without any special tuning conditions. Thus the seemingly flattened profiles found in many dwarfs do not contradict the cuspy profiles predicted by cosmological models. We also calculate the chemical evolution of stars and gas, to permit comparisons with observational data.