Results 51 to 60 of about 234,039 (316)
Fuzzy Dark Matter and Dark Matter Halo Cores [PDF]
The Astrophysical Journal, 2020 Abstract Whereas cold dark matter (CDM) simulations predict central dark matter cusps with densities that diverge as ρ(r) ∼ 1/r, observations often indicate constant-density cores with finite central densities ρ 0 and a flat density distribution within a core radius r 0.
openaire +3 more sources
The substructure hierarchy in dark matter haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We present a new algorithm for identifying the substructure within simulated dark matter haloes. The method is an extension of that proposed by Tormen et al. (2004) and Giocoli et al. (2008a), which identifies a subhalo as a group of self-bound particles that prior to being accreted by the main progenitor of the host halo belonged to one and the same ...
GIOCOLI, CARLO +3 more
openaire +4 more sources
Dark matter–radiation interactions: the impact on dark matter haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 Interactions between dark matter (DM) and radiation (photons or neutrinos) in the early Universe suppress density fluctuations on small mass scales. Here we perform a thorough analysis of structure formation in the fully non-linear regime using N-body simulations for models with DM-radiation interactions and compare the results to a traditional ...
Silvia Pascoli +5 more
openaire +6 more sources
Stellar Velocity Dispersion: Linking Quiescent Galaxies to their Dark Matter Halos [PDF]
, 2018 We analyze the Illustris-1 hydrodynamical cosmological simulation to explore the stellar velocity dispersion of quiescent galaxies as an observational probe of dark matter halo velocity dispersion and mass. Stellar velocity dispersion is proportional to dark matter halo velocity dispersion for both central and satellite galaxies.
arxiv +1 more source
The local dark matter distribution in self-interacting dark matter halos [PDF]
, 2022 We study the effects of dark matter self-interactions on the local dark matter distribution in selected Milky Way-like galaxies in the EAGLE hydrodynamical simulations. The simulations were run with two different self-interacting dark matter models, a constant and velocity-dependent self-interaction cross-section.
arxiv +1 more source
The shapes and alignments of dark matter halos [PDF]
Journal of Cosmology and Astroparticle Physics, 2012 We present measurements of the triaxial dark matter halo shapes and alignment correlation functions in the Millennium and Millennium-2 dark matter N-body simulations. These two simulations allow us to measure the distributions of halo shapes down to 10% of the virial radius over a halo mass range of 6E9 - 2E14 M_sun/h.
Shaun Cole +3 more
openaire +4 more sources
The Response of the Inner Dark Matter Halo to Stellar Bars
GalaxiesBarred galaxies constitute about two-thirds of observed disc galaxies. Bars affect not only the mass distribution of gas and stars but also that of the dark matter. An elongation of the inner dark matter halo is known as the halo bar.
Daniel A. Marostica +3 more
doaj +1 more source
Halo model description of the non-linear dark matter power spectrum at $k \gg 1$ Mpc$^{-1}$ [PDF]
, 2010 Accurate knowledge of the non-linear dark-matter power spectrum is important for understanding the large-scale structure of the Universe, the statistics of dark-matter haloes and their evolution, and cosmological gravitational lensing. We analytically model the dark-matter power spectrum and its cross-power spectrum with dark-matter haloes.
arxiv +1 more source
Strong Lensing with Finite Temperature Scalar Field Dark Matter [PDF]
Phys. Rev. D 88, 083008 (2013), 2013 We investigate the gravitational constraints imposed to dark matter halos in the context of finite temperature scalar field dark matter. We find constraints to produce multiple images by dark matter only, we show that there are differences with respect to the full Bose Einstein condensate halo when the temperature of the scalar field in dark matter ...
arxiv +1 more source
Disentangling the dark matter halo from the stellar halo [PDF]
Monthly Notices of the Royal Astronomical Society, 2011 The outer haloes of the Milky Way and Andromeda galaxies contain as much important information on their assembly and formation history as the properties of the discs resident in their centres. In this paper we have used the Constrained Local UniversE Simulation project to disentangle the stellar and DM component of three galaxies that resemble the MW ...
Libeskind, Noam I. +4 more
openaire +5 more sources