A Universal SFDM Halo Mass for the Andromeda and Milky Way's dSphs?

Abstract

Dwarf spheroidal galaxies are the most common type of galaxies, and are the most dark matter dominated objects in the Universe. Therefore, they are ideal laboratories to test any dark matter model. The Bose-Einstein condensate/scalar field dark matter model considers that the dark matter is composed by spinless-ultra-light particles which can be described by a scalar field. This model is an alternative to the $\Lambda$-cold dark matter model. In this work I study the kinematics of the dwarf spheroidal satellite galaxies of the Milky Way and Andromeda, under the scalar field/BEC dark matter paradigm in two limits: when the self interacting parameter is equal to zero, and when the self interacting parameter is $\gg 1$. I find that dwarf spheroidal galaxies with very high mass-to-light ratios (higher than $100$) are in better agreement with an NFW mass density profile. On the other hand, dwarf spheroidal galaxies with relatively low mass-to-light ratios and high luminosities are better described with the SFDM model. Such results are very encouraging to further test alternative dark matter models using the dynamics of dwarf galaxies as a tool.

10 pages, 6 Figures. Published in ApJ

References in corpus (8)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• A common mass scale for satellite galaxies of the Milky Way
• ${\varphi }^2$ as Dark Matter
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Cited by in corpus (4)

• Ultra-Light Dark Matter in Ultra-Faint Dwarf Galaxies
• Scalar Field Dark Matter: Helping or Hurting Small-Scale Problems in Cosmology?
• Scalar field dark matter with a cosh potential, revisited
• Scalar Field Dark Matter: Impact of Supernovae-driven blowouts on the soliton structure of low mass dark matter halos