On wave dark matter in spiral and barred galaxies

Journal Article (Journal Article)

We recover spiral and barred spiral patterns in disk galaxy simulations with a Wave Dark Matter (WDM) background (also known as Scalar Field Dark Matter (SFDM), Ultra-Light Axion (ULA) dark matter, and Bose-Einstein Condensate (BEC) dark matter). Here we show how the interaction between a baryonic disk and its Dark Matter Halo triggers the formation of spiral structures when the halo is allowed to have a triaxial shape and angular momentum. This is a more realistic picture within the WDM model since a non-spherical rotating halo seems to be more natural. By performing hydrodynamic simulations, along with earlier test particles simulations, we demonstrate another important way in which wave dark matter is consistent with observations. The common existence of bars in these simulations is particularly noteworthy. This may have consequences when trying to obtain information about the dark matter distribution in a galaxy, the mere presence of spiral arms or a bar usually indicates that baryonic matter dominates the central region and therefore observations, like rotation curves, may not tell us what the DM distribution is at the halo center. But here we show that spiral arms and bars can develop in DM dominated galaxies with a central density core without supposing its origin on mechanisms intrinsic to the baryonic matter.

Full Text

Duke Authors

Cited Authors

  • Martinez-Medina, LA; Bray, HL; Matos, T

Published Date

  • December 14, 2015

Published In

Volume / Issue

  • 2015 / 12

Electronic International Standard Serial Number (EISSN)

  • 1475-7516

Digital Object Identifier (DOI)

  • 10.1088/1475-7516/2015/12/025

Citation Source

  • Scopus