On wave dark matter in spiral and barred galaxies

Abstract

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.

15 pages, 6 figures. Accepted for publication in JCAP

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• Jeans instability and turbulent gravitational collapse of Bose-Einstein Condensate dark matter halos
• Ultra-light axions and the kinetic Sunyaev-Zel'dovich Effect
• Scalar field dark matter as an alternative explanation for the anisotropic distribution of satellite galaxies
• Bose-Einstein Condensate dark matter models in the presence of baryonic matter and random confining potentials
• Multistate scalar field dark matter and its correlation with galactic properties
• The $\kappa$-model, a minimal model alternative to dark matter. Application to the galactic rotation problem
• Could primordial galactic Magnetic Fields be generated by Charged Ultra-Light Boson Dark Matter?