Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-20
Mon.Not.Roy.Astron.Soc.378:541-550,2007
Astronomy and Astrophysics
Astrophysics
10 pages, 13 figures, MNRAS accepted; typo in email address fixed
Scientific paper
10.1111/j.1365-2966.2007.11753.x
We present a general recipe for constructing N-body realizations of galaxies comprised of near-spherical and disc components. First, an exact spherical distribution function for the spheroids (halo & bulge) is determined, such that it is in equilibrium with the gravitational monopole of the disc components. Second, an N-body realisation of this model is adapted to the full disc potential by growing the latter adiabatically from its monopole. Finally, the disc is sampled with particles drawn from an appropriate distribution function, avoiding local-Maxwellian approximations. We performed test simulations and find that the halo and bulge radial density profile very closely match their target model, while they become slightly oblate due to the added disc gravity. Our findings suggest that vertical thickening of the initially thin disc is caused predominantly by spiral and bar instabilities, which also result in a radial re-distribution of matter, rather than scattering off interloping massive halo particles.
Dehnen Walter
McMillan Paul J.
No associations
LandOfFree
Initial conditions for disc galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Initial conditions for disc galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial conditions for disc galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-122964