Speaker
Description
when the velocities of a group of galaxies converge to a single structure, they are
said to be part of the same supercluster. This structure has quantifiable properties
such as mass, volume, density and inertia, among others. Here we compare cosmolo-
gical simulations of N-bodies with the results obtained by Tully et al. (2014) when
determining these characteristics in Laniakea, our local supercluster. Given the po-
sition, velocity and mass data for each body of a simulation, the three-dimensional
space is discretized in order to obtain a vector map with the velocity of the center
of mass of each voxel. Taking into account the Gaussian behavior of the primordial
perturbations in the field of gravity that gave rise to the formation of structure on a
large scale, the velocity field in the three axes is smoothed with a Gaussian filter of a
certain width σ-vox. To determine the structure formation, the accretion for each voxel
is quantified and a scalar field with this information is created. We implemented the
watershed algorithm in the scalar field to reconstruct and segregate the superclusters
present in the simulation. Evaluating geometric and physical properties we find that
Laniakea is an atypical event in terms of form, volume and mass within the framework
of cosmological simulations
