# The dichotomy of dark matter fraction and total mass density slope of galaxies over five dex in mass

@article{Tortora2019TheDO,
title={The dichotomy of dark matter fraction and total mass density slope of galaxies over five dex in mass},
author={Crescenzo Tortora and Lorenzo Posti and L{\'e}on V. E. Koopmans and Nicola R. Napolitano},
journal={arXiv: Astrophysics of Galaxies},
year={2019}
}
• Crescenzo Tortora, +1 author Nicola R. Napolitano
• Published 2019
• Physics
• arXiv: Astrophysics of Galaxies
• We analyse the mass density distribution in the centres of galaxies across a mass range of about five orders of magnitude. Using high-quality spiral-galaxy rotation curves and infrared photometry from the SPARC database, we conduct a systematic study of their central dark matter fraction ($f_{\rm DM}$) calculated within the effective radius and their mass density slope ($\alpha$). We show that lower-mass spiral galaxies are more dark matter dominated and have more shallow mass density slopes… CONTINUE READING

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