Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them

Details Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them

1997-10-13

arxiv.org/abs/astro-ph/9710125v1

Astronomy and Astrophysics

Astrophysics

12 pages including 5 eps figures, submitted to MNRAS

Scientific paper

We use large N-body simulations of dissipationless gravitational clustering in cold dark matter (CDM) cosmologies to study whether the properties of dark matter halos are affected by their environment. We look for correlations between the masses, formation redshifts, concentrations, shapes and spins of halos and the overdensity of their local environment. We also look for correlations of these quantities with the local tidal field. Our conclusion is extremely simple. Only the mass distribution varies as a function of environment. This variation is well described by a simple analytic formula based on the conditional Press-Schechter theory. We find no significant dependence of any other halo property on environment. Our results do not depend on our choice of cosmology. According to current hierarchical models, the structure and evolutionary history of a galaxy is fully determined by the structure and evolutionary history of the dark halo in which it is embedded. If these models are correct, clustering variations between galaxies of differing morphological types, luminosities, colours and surface brightnesses, must all arise because the halo mass function is skewed towards high mass objects in overdense regions of the Universe and towards low mass objects in underdense regions.

Affiliated with

Also associated with

No associations

Rating

Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them 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 Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Environmental Influences on Dark Matter Halos and Consequences for the Galaxies Within Them will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-562084