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On the spin parameter of dark-matter haloes | | Matthias Steinmetz
; Matthias Bartelmann
; | | Date: |
10 Mar 1994 | | Subject: | astro-ph | | Abstract: | The study by White (1984) on the growth of angular momentum in dark haloes is extended towards a more detailed investigation of the spin parameter $lambdaequiv Lsqrt{E}/{G M^{2.5}}$. Starting from the Zel’dovich approximation to structure formation, a dark halo is approximated by a homogeneous ellipsoid with the inertial tensor of the (highly irregular) Lagrangian region $Upsilon$ from which the dark halo forms. Within this approximation, an expression for the spin parameter can be derived, which depends on the geometry of $Upsilon$, the cosmological density parameter $Omega_0$, the overdensity of the dark halo, and the tidal torque exerted on it. For Gaussian random fields, this expression can be evaluated statistically. As a result, we derive a probability distribution of the spin parameter which gives $lambdasimeq0.07^{+0.04}_{-0.05}$, consistent with numerical investigations. This probability distribution steeply rises with increasing spin parameter, reaching its maximum at $lambdasimeq0.025$. The 10 (50,90) percentile values are $lambda=0.02$ (0.05,0.11, respectively). There is a weak anticorrelation of the spin parameter with the peak height $
u$ of the density fluctuation field $lambdapropto
u^{-0.29}$. The dependence on $Omega_0$ and the variance $sigma$ of the density-contrast field is very weak; there is only a marginal tendency for the spin parameter to be slightly larger for late-forming objects in an open universe. Due to the weak dependence on $sigma$, our results should be quite generally applicable and independent on | | Source: | arXiv, astro-ph/9403017 | | Services: | Forum | Review | PDF | Favorites | |
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