High-resolution simulations of a cluster of galaxies
If you like, you may download a ![]() Pic 1: As a starting point, we used the LCDM-GIF simulation, carried
out by the ![]()
Pic2: The following two pictures compare the original cluster
in the GIF simulation with one of our resimulations. In the latter, the
resolution gradually decreases with increasing distance from the center.
You may be able to see residuals of the spherical grid structure used
in this multi-mass technique towards the edges of the right picture. However,
in the the region of the cluster itself, glass-like initial conditions
are used and the resolution is much higher than in the original parent
simulation.
Pic 3: The vast increase of resolution makes rich substructure in the cluster visible. Dark matter halos in CDM universes are far from being smooth objects - they exhibit a large number of subhalos. As we've done in picture on the top, we now enlarge the region in the white square still further, thereby zooming in onto the cluster itself....
Pic 4 & 5: Here are a few more examples of substructure in our clusters. The blue picture at the bottom shows the cluster in our highest resolution simulation. At the final time at redshift zero, our subhalo identification algorithms are able to identify almost 5000 gravitationally bound subhalos in this object.
Comments to: Volker Springel |