Year: 2012
Type: article
Abstract: We present the origami method of identifying structures, particularly halos, in cosmological N -body simulations. Structure formation can be thought of as the folding of an initially flat three-dimensional manifold in six-dimensional phase space. origami finds the outer folds that delineate these structures. Halo particles are identified as those that have undergone shell-crossing along three orthogonal axes, providing a dynamical definition of halo regions that is independent of density. origami also identifies other morphological structures: particles that have undergone shell-crossing along 2, 1, or 0 orthogonal axes correspond to filaments, walls, and voids, respectively. We compare this method to a standard friends-of-friends halo-finding algorithm and find that origami halos are somewhat larger, more diffuse, and less spherical, though the global properties of origami halos are in good agreement with other modern halo-finding algorithms.
Source: The Astrophysical Journal
Authors: Bridget L. Falck, Mark C. Neyrinck, Alexander S. Szalay
Institution: Johns Hopkins University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2090115277