On the newtonian limit and cut--off scales of isothermal dark matter halos with cosmological constant

Details On the newtonian limit and cut--off scales of isothermal dark matter halos with cosmological constant On the newtonian limit and cut--off scales of isothermal dark matter halos with cosmological constant

2003-04-22

arxiv.org/abs/astro-ph/0304385v2

Mon.Not.Roy.Astron.Soc. 345 (2003) 871

Astronomy and Astrophysics

Astrophysics

13 pages, 19 figures, Accepted in MNRAS, includes minor corrections suggested by the referee

Scientific paper

10.1046/j.1365-8711.2003.07010.x

We examine isothermal dark matter halos in hydrostatic equilibrium with a cosmological constant Lambda =Omega_\Lambda rho_{crit}c^2, where Omega_\Lambda=0.7, and rho_{crit} is the present value of the critical density with h=0.65. The Newtonian limit of General Relativity yields equilibrium equations that are different from those arising by merely coupling an ``isothermal sphere'' to the Lambda-field within a Newtonian framework. The conditions for the existence and stability of circular geodesic orbits show the existence of (I) an ``isothermal region'' (0r_1) dominated by the Lambda-field, where the Newtonian potential oscillates and circular orbits exist in disconnected patches of the domain of r; (III) a ``transition region'' (r_20.008 M_\odot {pc}^3, in agreement with rotation curve studies of dwarf galaxies. Since r_2 marks the largest radius of a stable circular orbit, it provides a ``cut off'' radius. For current estimates of rho_c and velocity dispersion of galactic structures, this is around five times larger than the virialization radius. The effects of the Lambda$--field can hence be ignored in structure formation models, but could be significant in the dynamics of superclusters in the linear regime or of gravitational clustering at large scales.

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