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Title

Dynamics of pairwise motions

Authors
Juszkiewicz, Roman
Springel, Volker
Published in Astrophysical Journal Letters. 1999, vol. 518, p. L25-L28
Abstract We propose a simple closed-form expression relating [...] the mean relative velocity of pairs of galaxies at fixed separation r—to the two-point correlation function of mass density fluctuations,[...]. Our Ansatz is an interpolation between the perturbative and stable clustering expressions for [...]. We compare our analytic model for [...] with N-body simulations and find excellent agreement in the entire dynamical range probed by the simulations ([...]). Our results can be used to estimate the cosmological density parameter, Ω, directly from redshift-distance surveys.
Keywords cosmology: observationscosmology: theorygalaxies: kinematics and dynamics
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JUSZKIEWICZ, Roman, SPRINGEL, Volker, DURRER, Ruth. Dynamics of pairwise motions. In: Astrophysical Journal Letters, 1999, vol. 518, p. L25-L28. https://archive-ouverte.unige.ch/unige:974

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Deposited on : 2009-02-26

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