Dark matter spiral arms in Milky Way-like halos
arXiv:2503.07753 · doi:10.1051/0004-6361/202554458
Abstract
The coupling between the dark matter (DM) halo and the stellar disc is a key factor in galactic evolution. While the interaction between structures like the Galactic bar and DM halos has been explored (e.g. slowing down of the bar due to dynamical friction), the effect of spiral arms on the DM halo distribution has received limited attention. We analyze a suite of simulations featuring strong stellar spiral arms, ranging in complexity from test-particle models to fully cosmological hydrodynamical simulations. Using Fourier transforms, we characterize the phase and amplitude of the stellar spirals at different times and radii. We then apply the same methodology to DM particles near the stellar disc and compare trends in Fourier coefficients and phases between the two components. We detect a clear spiral arm signal in the DM distribution, correlated with the stellar spirals, confirming the reaction of the halo. The strength of the DM spirals consistently measures around 10\% of that of the stellar spiral arms. In the -body simulation, the DM spiral persistently trails the stellar spiral arm by approximately . A strong spiral signal of a few km\,s appears in the radial, azimuthal, and vertical velocities of halo particles, distinct from the stellar kinematic signature. In a test-particle simulation with an analytical spiral potential (omitting self-gravity), we reproduce a similar density and kinematic response, showing that the test-particle halo responds in the same way as the -body halo. Finally, we also find the rest of the simulations, indicating that the dynamical signatures of the forced response in the DM halo are independent of the dynamical origin of the stellar spiral arms. We reveal the ubiquitous presence of DM spiral arms in Milky Way-like galaxies, driven by a forced response to the stellar spiral potential. (ABR)
arXiv comment14 pages, 9 figures. Accepted for publication in Astronomy & Astrophysics
References in corpus (64)
- Planck 2018 results. I. Overview and the cosmological legacy of Planck
- DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
- The mass distribution and gravitational potential of the Milky Way
- Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
- What determines the strength and the slowdown rate of bars ?
- Constraints from Dynamical Friction on the Dark Matter Content of Barred Galaxies
- AGAMA: Action-based galaxy modelling architecture
- A dynamically young and perturbed Milky Way disk
- The Effect of the Outer Lindblad Resonance of the Galactic Bar on the Local Stellar Velocity Distribution
- Three Dimensional Structure of the Milky Way Disk
- The Arepo public code release
- Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
- Dynamical Friction and the Distribution of Dark Matter in Barred Galaxies
- Footprints of the Sagittarius dwarf galaxy in the data set
- Dawes Review 4: Spiral Structures in Disc Galaxies
- The Influence of Sagittarius and the Large Magellanic Cloud on the Milky Way Galaxy
- Bar-driven dark halo evolution: a resolution of the cusp--core controversy
- Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud
- The dynamics of stars around spiral arms
- Radial Migration in Disk Galaxies I: Transient Spiral Structure and Dynamics
- And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive Large Magellanic Cloud
- Response of the Milky Way's disc to the Large Magellanic Cloud in a first infall scenario
- On the origin of rR_1 ring structures in barred galaxies
- Bending and Breathing Modes of the Galactic Disk
- The origin of the Gaia phase-plane spiral
- Radial and vertical flows induced by galactic spiral arms: likely contributors to our "wobbly Galaxy''
- The properties of the local spiral arms from RAVE data: two-dimensional density wave approach
- Detection of the Milky Way reflex motion due to the Large Magellanic Cloud infall
- Analytical Expressions for Spiral Arm Gravitational Potential and Density
- The effects of bar-spiral coupling on stellar kinematics in the Galaxy
- An iterative method for the construction of N-body galaxy models in collisionless equilibrium
- Weakly Damped Modes in Star Clusters and Galaxies
- Action-based distribution functions for spheroidal galaxy components
- Modelling the Galactic disc: perturbed distribution functions in the presence of spiral arms
- Determining the full satellite population of a Milky Way-mass halo in a highly resolved cosmological hydrodynamic simulation
- On the galaxy spiral arms' nature as revealed by rotation frequencies
- Invariant manifolds, phase correlations of chaotic orbits and the spiral structure of galaxies
- The Vertical Structure and Kinematics of Grand Design Spirals
- Self-consistent flattened isochrone models
- Merger-induced galaxy transformations in the ARTEMIS simulations
- Quantifying the Stellar Halo's Response to the LMC's Infall with Spherical Harmonics
- Dark matter halo shapes in the Auriga simulations
- Spiral and bar driven peculiar velocities in Milky Way sized galaxy simulations
- Stellar halo substructure generated by bar resonances
- Bringing the Galaxy's dark halo to life
- Energy wrinkles and phase-space folds of the last major merger
- Dark Matter Trapping by Stellar Bars: The Shadow Bar
- Tidally induced spiral arm wraps encoded in phase space
- Radial halo substructure in harmony with the Galactic bar
- The impact of galactic feedback on the shapes of dark-matter haloes
- Mapping the anisotropic Galactic stellar halo with Blue Horizontal Branch stars
- Dynamical Friction, Buoyancy and Core-Stalling -- I. A Non-perturbative Orbit-based Analysis
- Dark Matter Bars in Spinning Halos
- The Coupling of Galactic Dark Matter Halos with Stellar Bars
- Age dissection of the vertical breathing motions in Gaia DR2: evidence for spiral driving
- Kinematics of symmetric Galactic longitudes to probe the spiral arms of the Milky Way with Gaia
- Density waves in the shearing sheet IV. Interaction with a live dark halo
- A Holistic Review of a Galactic Interaction
- The relative efficiencies of bars and clumps in driving disc stars to retrograde motion
- Dynamical Data Mining Captures Disc-Halo Couplings that Structure Galaxies
- Spiral instabilities: little interaction with a live halo
- Interaction between a galactic disk and a live dark halo with an anisotropic velocity distribution
- First spiral arm detection using dynamical mass measurements of the Milky Way disk
- Estimating the Oblateness Of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion