C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:40:17

2013A&A...558L...3B - Astronomy and Astrophysics, volume 558, L3-3 (2013/10-1)

An analytic distribution function for a mass-less cored stellar system in a cuspy dark-matter halo.


Abstract (from CDS):

We demonstrate the existence of a distribution function that can be used to represent spherical mass-less cored stellar systems having constant mildly tangential velocity anisotropy embedded in cuspy dark-matter halos. In particular, we derived analytically the functional form of the distribution function for a Plummer stellar sphere in a Hernquist dark halo for β0=-0.5 and for different degrees of embedding. This particular example satisfies the condition that the central logarithmic slope of the light profile γ0>2β0. Our models have velocity dispersion profiles similar to those observed in nearby dwarf spheroidal galaxies. Hence they can be used to generate initial conditions for a variety of problems, including N-body simulations that may represent dwarf galaxies in the Local Group.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: kinematics and dynamics

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1178 0
2 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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