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