# The influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies

## TL;DR

This study investigates whether the void environment influences the relationship between dark matter halo mass and stellar mass in galaxies, finding no significant environmental dependence using SDSS MaNGA data.

## Contribution

It provides the first detailed comparison of dark matter to stellar mass ratios in void versus denser galaxies using spectroscopic kinematic measurements.

## Key findings

- No difference in the stellar-to-halo-mass relation between environments.
- Dark matter halo profile shape appears environment-independent.
- Gas-phase metallicity is unaffected by void environment.

## Abstract

We study how the void environment affects the formation and evolution of galaxies in the universe by comparing the ratio of dark matter halo mass to stellar mass of galaxies in voids with galaxies in denser regions. Using spectroscopic observations from the SDSS MaNGA DR15, we estimate the dark matter halo mass of 642 void galaxies and 938 galaxies in denser regions. We use the relative velocities of the H-alpha emission line across the galaxy's surface to measure the rotation curve of each galaxy because the kinematics of the interstellar medium is smoother than the stellar kinematics. We find that neither the stellar-to-halo-mass relation nor the relationship between the gas-phase metallicity and the ratio of dark matter halo mass to stellar mass is affected by the void environment. We also observe no difference in the distribution of the ratio of dark matter halo mass to stellar mass between void galaxies and galaxies in denser regions, implying that the shape of the dark matter halo profile is independent of a galaxy's environment.