Results 1 to 10 of about 457,129 (69)

Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies [PDF]

open access: bronzeThe Astrophysical Journal, 2003
5 pages, 1 figure, accepted for publication in ...
F. J. Snchez-Salcedo
arxiv   +5 more sources

Incorporating baryon-driven contraction of dark matter halos in rotation curve fits [PDF]

open access: yesA&A 665, A143 (2022), 2022
The condensation of baryons within a dark matter (DM) halo during galaxy formation should result in some contraction of the halo as the combined system settles into equilibrium. We quantify this effect on the cuspy primordial halos predicted by DM-only simulations for the baryon distributions observed in the galaxies of the SPARC database. We find that
arxiv   +1 more source

How black holes turn cusps into cores [PDF]

open access: yesAstrophys.Space Sci. 284 (2003) 561-564, 2002
Collapsing collisionless particle systems form gravitational bound halos with cuspy density profiles. Also hierarchical merging of these systems produce remnants with cuspy central density profiles. These results lead to the assumption of cuspy NFW profiles for the density distribution in dark matter halos.
arxiv   +1 more source

A Limit on the Cosmological Mass Density and Power Spectrum from the Rotation Curves of Low Surface Brightness Galaxies [PDF]

open access: yesAstrophys.J. 584 (2003) 566-576, 2002
The concentrations of the cuspy dark matter halos predicted by simulations of cold dark matter are related to the cosmology in which the halos form. Observational constraints on halo concentration therefore map into constraints on cosmological parameters.
arxiv   +1 more source

A cuspy dark matter halo [PDF]

open access: yes, 2021
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 rho ~ r^alpha with alpha between -1 and -1.5, while such a cuspy profile has not been clearly observed.
arxiv   +1 more source

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

open access: yes2011, MNRAS, 414, 3617, 2010
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
arxiv   +1 more source

Are Halos of Collisionless Cold Dark Matter Collisionless? [PDF]

open access: yesPhys.Rev.Lett. 93 (2004) 021301, 2004
Much recent discussion about dark matter has been centered on two seemingly independent problems: the abundance of substructure in dark matter halos, and the cuspiness of the halos' inner density profile. We explore possible connections between the two problems by studying the gravitational scattering effects due to subhalos on the phase-space ...
arxiv   +1 more source

Major Mergers of Galaxy Haloes: Cuspy or Cored Inner Density Profile? [PDF]

open access: yesMon.Not.Roy.Astron.Soc.349:1117,2004, 2003
We present the results from a series of collisionless N-body simulations of major mergers of galaxy dark matter haloes with density profiles having either inner cusps or cores. Our simulations range from 2x10^5 to 10^7 particles, allowing us to probe the phase-space distribution of dark matter particles in the innermost regions (less than 0.005 virial ...
arxiv   +1 more source

Expanded haloes, abundance matching and too-big-to-fail in the Local Group [PDF]

open access: yes, 2014
Observed kinematical data of 40 Local Group (LG) members are used to derive the dark matter halo mass of such galaxies. Haloes are selected from the theoretically expected LG mass function and two different density profiles are assumed, a standard universal cuspy model and a mass dependent profile which accounts for the effects of baryons in modifying ...
arxiv   +1 more source

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