The dark matter halo density profile, spiral arm morphology and black hole mass of M33

TL;DR

This study models M33's dark matter halo using an NFW profile, revealing correlations between halo concentration, spiral arm structure, and black hole mass, thus linking galaxy morphology with dark matter properties.

Contribution

It provides the first detailed NFW profile fit for M33 and demonstrates correlations between halo concentration, spiral arm pitch angle, and black hole mass.

Findings

NFW profile best fits M33's rotation curve

Halo concentration correlates with spiral arm pitch angle

Halo concentration correlates with supermassive black hole mass

Abstract

In this paper, we investigate the dark matter halo density profile of M33. We find that the HI rotation curve of M33 is best described by a NFW dark matter halo density profile model, with a halo concentration of cvir = 4.0\pm1.0 and a virial mass of Mvir = (2.2\pm0.1)\times10^11 Msun. We go on to use the NFW concentration (cvir)of M33, along with the values derived for other galaxies (as found in the literature), to show that cvir correlates with both spiral arm pitch angle and supermassive black hole mass.