Results 11 to 20 of about 454,773 (69)
Recovering cores and cusps in dark matter haloes using mock velocity field observations [PDF]
2011, 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
A Scalar Field Dark Matter Model and Its Role in the Large‐Scale Structure Formation in the Universe
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 We present a model of dark matter based on scalar‐tensor theory of gravity. With this scalar field dark matter model we study the non‐linear evolution of the large‐scale structures in the universe. The equations that govern the evolution of the scale factor of the universe are derived together with the appropriate Newtonian equations to follow the ...
Mario A. Rodríguez-Meza, Dario Nuñez
wiley +1 more source
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 We review numerical works carried out over the last decade on the role of environmental mechanisms in shaping nature of the faintest galaxies known, dwarf spheroidals (dSphs). The combination of tidally induced morphological transformation, termed tidal stirring, with mass loss due to tidal and ram‐pressure stripping aided by heating due to the cosmic ...
Lucio Mayer, Andrey V. Kravtsov
wiley +1 more source
Dark Matter Substructure and Dwarf Galactic Satellites
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 A decade ago cosmological simulations of increasingly higher resolution were used to demonstrate that virialized regions of Cold Dark Matter (CDM) halos are filled with a multitude of dense, gravitationally bound clumps. These dark matter subhalos are central regions of halos that survived strong gravitational tidal forces and dynamical friction during
Andrey Kravtsov, Ulrich Hopp
wiley +1 more source
Are Halos of Collisionless Cold Dark Matter Collisionless? [PDF]
Phys.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
Kinematics of Milky Way Satellites: Mass Estimates, Rotation Limits, and Proper Motions
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 In the past several years kinematic data sets from Milky Way satellite galaxies have greatly improved, furthering the evidence that these systems are the most dark matter dominated objects known. This paper discusses a maximum likelihood formalism that extracts important quantities from these kinematic data sets, including the amplitude of a rotational
Louis E. Strigari, Andrey V. Kravtsov
wiley +1 more source
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 This paper gives an overview of the attempts to determine the distribution of dark matter in low surface brightness disk and gas‐rich dwarf galaxies, both through observations and computer simulations. Observations seem to indicate an approximately constant dark matter density in the inner parts of galaxies, while cosmological computer simulations ...
W. J. G. de Blok, Elias Brinks
wiley +1 more source
Major Mergers of Galaxy Haloes: Cuspy or Cored Inner Density Profile? [PDF]
Mon.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]
, 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
Fornax globular cluster distributions: implications for the cusp-core problem [PDF]
, 2019 We re-investigate the Fornax cusp-core problem using observational results on the spatial and mass distributions of globular clusters (GCs) in order to put constraints on the dark matter profile. We model Fornax using high-resolution N-body simulations with entirely live systems, i.e.
arxiv +1 more source