Jeans analysis for dwarf spheroidal galaxies in wave dark matter
Journal
Monthly Notices of the Royal Astronomical Society
Journal Volume
468
Journal Issue
2
Pages
1338-1348
Date Issued
2017
Author(s)
Abstract
Although still under debate, observations generally suggest that dwarf spheroidal (dSph) galaxies exhibit large constant-density cores in the centres, which can hardly be explained by dissipationless cold dark matter simulations without baryonic feedback. Wave dark matter (ψDM), characterized by a single parameter, the dark matter particle mass mψ, predicts a central soliton core in every galaxy arising from quantum pressure against gravity. Here we apply Jeans analysis assuming a soliton core profile to the kinematic data of eight classical dSphs so as to constrain mψ, and obtain mψ = 1.18+0.28-0.24 × 10−22 and 1.79+0.35−0.33 × 10−22 eV(2σ) using the two different observational data sets of Walker et al. We show that the estimate of mψ is sensitive to the dSph kinematic data sets and is robust to various models of stellar density profile. We also consider multiple stellar subpopulations in dSphs and find consistent results. This mass rangeof mψ is in good agreement with other independent estimates, such as the high-redshift luminosity functions, the reionization history and the Thomson optical depth to the cosmic microwave background. © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Subjects
Dark matter; Galaxies: dwarf; Galaxies: kinematics and dynamics; Local Group
Other Subjects
Cosmology; Gravitation; Kinematics; Solitons; Stars; Cold dark matters; Constant density; Dark matter; Dark matter particles; Data set; Galaxies: dwarf; Galaxies: Kinematics and dynamics; Kinematic data; Local groups; Single parameter; Galaxies
Type
journal article