This is an interactive viewer of the cosmological simulation MassiveBlack II (Khandai et al. MNRAS submitted, 2014). The hydrodynamical simulation uses 2 times 5 billion particles (half gas, half dark matter) to track the motion of baryons, dark matter in a 100 Mpc/h (about half billion light years) box, since not far from the Big Bang to today. The best tool to visualize simulation of such scale is Gigapan.
Shown here is the density of gas (Gas Layer) and the galaxies (Stellar Layer). The density of gas is color coded by its temperature: Red corresponds to 100 million Kelvin, and blue corresponds to 10000 Kelvin. The galaxies are colored with a scheme similar to the images captured in the Sloan Digital Sky Survey. You really have to zoom-in very deep to see the galaxies, because the sky is quite dark indeed.
The galaxies (subhalos) are labelled with green crosses. If a galaxy is the central galaxy of the cluster (group), the cross has a circle. Currently selected galaxy is surrounded by a rectangle. We limit the number of galaxies shown to 40 most massive ones, but it can be changed in "Number of Galaxies".
To switch between different snapshots, use the dropdown box "Snapshot". To switch between different layers, use the dropdown box "Layers". To jump to a cluster, type its ID and click "Jump". To search for galaxies in the current view, click "Search".
Click on a label and zoom onto the galaxy. The properties of the
galaxy is shown in a pop up.
Yu Feng @ CMU 2014