Reconstructing the cosmic density field with the distribution of dark matter halos

Understand

We develop a new method to reconstruct the cosmic density field from the distribution of dark matter haloes above a certain mass threshold.

• Our motivation is that well-defined samples of galaxy groups/clusters, which can be used to represent the dark halo population, can now be selected from large redshift surveys of galaxies, and our ultimate goal is to use such data to reconstruct the cosmic density field in the local universe.
• Our reconstruction method starts with a sample of dark matter haloes above a given mass threshold.
• Each volume element in space is assigned to the domain of the nearest halo according to a distance measure that is scaled by the virial radius of the halo.