Hierarchical clustering - Angular momentum versus density

Details Hierarchical clustering - Angular momentum versus density Hierarchical clustering - Angular momentum versus density

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301...65h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 65-69.

Other

45

Angular Momentum, Cosmology, Galactic Clusters, Galactic Evolution, Space Density, Correlation, Density Distribution, Galactic Structure, Gravitational Collapse, Hierarchies

Scientific paper

The growth of angular momentum in a general clustering scenario is analyzed and its correlation with the primordial density perturbation delta0 is calculated. High-density peaks are found to evolve into low-angular momentum systems. The basic mechanism behind this anticorrelation is that anisotropic structure, which leads to angular momentum gain, is statistically uncorrelated with the primordial perturbation. The collapse time, on the other hand, is correlated with it. This time scale is the one that determines the angular momentum of a bound object. Three cases are studied, and the correlation of J with delta0 is calculated: (1) Lagrangian sphere (quasi-linear evolution); (2) Eulerian sphere (second order in delta); (3) arbitrary Lagrangian volume (first order in delta).

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