Recovering cores and cusps in dark matter haloes using mock velocity field observations

  title={Recovering cores and cusps in dark matter haloes using mock velocity field observations},
  author={Rachel Kuzio de Naray and Tobias Kaufmann},
  journal={Monthly Notices of the Royal Astronomical Society},
We present mock DensePak Integral Field Unit (IFU) velocity fields, rotation curves, and halo fits for disc galaxies formed in spherical and triaxial cuspy dark matter haloes, and spherical cored dark matter haloes. The simulated galaxies are “observed” under a variety of realistic conditions to determine how well the underlying dark matter halo can be recovered and to test the hypothesis that cuspy haloes can be mistaken for cored haloes. We find that the appearance of the velocity field is… 
High-quality observations of dark-matter-dominated low surface brightness (LSB) galaxies indicate that, in contrast to the triaxial, centrally concentrated cuspy halos formed in collisionless
Statistical properties of the dark matter haloes of dwarf galaxies and correlations with the environment
According to the now strongly supported concordance Λ cold dark matter model, galaxies may be grossly described as a luminous component embedded in a dark matter halo. The density profile of these
Cores in warm dark matter haloes: a Catch 22 problem
The free streaming of warm dark matter particles dampens the fluctuation spectrum, flattens the mass function of haloes and imprints a fine grained phase density limit for dark matter structures. The
Scalar field dark matter mass model and evolution of rotation curves for low surface brightness galaxies
We study the evolution of gas rotation curves within the scalar field dark matter (SFDM) model. In this model, the galactic haloes are astronomical Bose–Einstein condensate drops of scalar field
Dark matter heats up in dwarf galaxies
Gravitational potential fluctuations driven by bursty star formation can kinematically ‘heat up’ dark matter at the centres of dwarf galaxies. A key prediction of such models is that, at a fixed dark
EDGE: two routes to dark matter core formation in ultra-faint dwarfs
In the standard Lambda cold dark matter paradigm, pure dark matter simulations predict dwarf galaxies should inhabit dark matter haloes with a centrally diverging density ‘cusp’. This is in
A Cuspy Dark Matter Halo
The cusp–core problem is one of the main challenges of the cold dark matter paradigm on small scales; the density of a dark matter halo is predicted to rise rapidly toward the center as ρ(r) ∝ r α
Dark matter halo merger histories beyond cold dark matter – I. Methods and application to warm dark matter
We describe a methodology to accurately compute halo mass functions, progenitor mass functions, merger rates and merger trees in non-cold dark matter universes using a self-consistent treatment of
Dark matter cores all the way down
We use high-resolution simulations of isolated dwarf galaxies to study the physics of dark matter cusp-core transformations at the edge of galaxy formation: M200 = 107-109 M⊙. We work at a resolution
No cores in dark matter-dominated dwarf galaxies with bursty star formation histories
Measurements of the rotation curves of dwarf galaxies are often interpreted as requiring a constant density core at the centre, at odds with the ‘cuspy’ inner profiles predicted by N-body


The Structure of cold dark matter halos
High resolution N-body simulations show that the density profiles of dark matter halos formed in the standard CDM cosmogony can be fit accurately by scaling a simple “universal” profile. Regardless
The Case Against Warm or Self-Interacting Dark Matter as Explanations for Cores in Low Surface Brightness Galaxies
Warm dark matter (WDM) and self-interacting dark matter (SIDM) are often motivated by the inferred cores in the dark matter halos of low surface brightness (LSB) galaxies. We test thermal WDM,
Bulgeless dwarf galaxies and dark matter cores from supernova-driven outflows
Hydrodynamical simulations in a framework assuming the presence of CDM and a cosmological constant are reported in which the inhomogeneous interstellar medium is resolved and the analogues of dwarf galaxies—bulgeless and with shallow central dark-matter profiles—arise naturally in these simulations.
Cosmological simulations indicate that cold dark matter (CDM) halos should be triaxial. Validating this theoretical prediction is, however, less than straightforward because the assembly of galaxies
We make a direct comparison of the derived dark matter (DM) distributions between hydrodynamical simulations of dwarf galaxies assuming a ΛCDM cosmology and the observed dwarf galaxies sample from
The cores of dwarf galaxy haloes
We use N-body simulations to examine the effects of mass outflows on the density profiles of cold dark matter (CDM) halos surrounding dwarf galaxies. In particular, we investigate the consequences of
Self-consistent massive disks in triaxial dark matter halos
Galactic disks in triaxial dark matter halos become deformed by the elliptical potential in the plane of the disk in such a way as to counteract the halo ellipticity. We develop a technique to
The origin and tidal evolution of cuspy triaxial haloes
We present a technique for constructing equilibrium triaxial N-body haloes with nearly arbitrary density profiles, axial ratios and spin parameters. The method is based on the way in which structures
Is There Evidence for Flat Cores in the Halos of Dwarf Galaxies? The Case of NGC 3109 and NGC 6822
Two well-studied dwarf galaxies, NGC 3109 and NGC 6822, present some of the strongest observational support for a flat core at the center of galactic dark matter (DM) halos. We use detailed,
The dwarf galaxy DDO 47 as a dark matter laboratory: testing cusps hiding in triaxial halos and the MOND paradigm
We present an analysis of high-resolution H I data of the dwarf galaxy DDO 47, aimed at testing the hypothesis that dark halo triaxiality might induce noncircular motions resulting in rotation curves