Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations

Details Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations

2005-12-15

arxiv.org/abs/astro-ph/0512405v1

Mon.Not.Roy.Astron.Soc.370:1361-1371,2006

Astronomy and Astrophysics

Astrophysics

12 pages, 9 figures. submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10570.x

We test the ability of the numerical action method (NAM) to recover the individual orbit histories of mass tracers in an expanding universe in a region of radius 26Mpc/h, given the masses and redshift-space coordinates at the present epoch. The mass tracers are represented by dark matter haloes identified in a high resolution N-body simulation of the standard LCDM cosmology. Since previous tests of NAM at this scale have traced the underlying distribution of dark matter particles rather than extended haloes, our study offers an assessment of the accuracy of NAM in a scenario which more closely approximates the complex dynamics of actual galaxy haloes. We show that NAM can recover present-day halo distances with typical errors of less than 3 per cent, compared to 5 per cent errors assuming Hubble flow distances. The total halo mass and the linear bias were both found to be constained at the 50 per cent level. The accuracy of individual orbit reconstructions was limited by the inability of NAM, in some instances, to correctly model the positions of haloes at early times solely on the basis of the redshifts, angular positions, and masses of the haloes at the present epoch. Improvements in the quality of NAM reconstructions may be possible using the present-day three-dimensional halo velocities and distances to further constrain the dynamics. This velocity data is expected to become available for nearby galaxies in the coming generations of observations by SIM and GAIA.

Affiliated with

Also associated with

No associations

Rating

Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations 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 Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerical action reconstruction of the dynamical history of dark matter haloes in N-body simulations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-167719