The Astrophysical Journal · 1987 · 502 citations · 0 references
The authors describe results for the origin of angular momentum of bound objects in large cosmological N‑body simulations. Three sets of models are analyzed: one with white‑noise initial conditions and two in which the initial conditions have more power on large scales, as predicted in cold dark matter (CDM) models. Statistical analysis shows that the dimensionless spin parameter λ is remarkably insensitive to the initial perturbation spectrum, has a median value of 0.05, is weakly correlated with mass and substructure, uncorrelated with initial overdensity, and in CDM models high‑λ groups are more clustered and have nearer neighbours than low‑λ groups. Published in The Astrophysical Journal (1987) DOI:10.1086/165480.
view Abstract Citations (612) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Angular Momentum from Tidal Torques Barnes, Joshua ; Efstathiou, George Abstract The authors describe results for the origin of angular momentum of bound objects in large cosmological N-body simulations. Three sets of models are analyzed: one with white-noise initial conditions and two in which the initial conditions have more power on large scales, as predicted in models with cold dark matter (CDM). Statistical analysis of large catalogs of objects shows that the dimensionless spin parameter λ is remarkably insensitive to the initial perturbation spectrum and has a median value λme≡ 0.05. The quantity λ is weakly correlated with mass and internal substructure and is uncorrelated with initial overdensity. In CDM models, groups with high λ-values tend to have nearer neighbors and are more strongly clustered than groups with low λ; these effects are weaker or absent in white-noise models. Publication: The Astrophysical Journal Pub Date: August 1987 DOI: 10.1086/165480 Bibcode: 1987ApJ...319..575B Keywords: Angular Momentum; Dark Matter; Galactic Clusters; Galactic Evolution; Many Body Problem; Tides; Astronomical Models; Galactic Rotation; White Noise; Astrophysics; GALAXIES: CLUSTERING; GALAXIES: FORMATION; GALAXIES: INTERNAL MOTIONS full text sources ADS |