ORIGAMI: Delineating Halos using Phase-Space Folds

Details ORIGAMI: Delineating Halos using Phase-Space Folds ORIGAMI: Delineating Halos using Phase-Space Folds

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940207f&link_type=abstract

American Astronomical Society, AAS Meeting #219, #402.07

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Scientific paper

We discuss the ORIGAMI halo-finding algorithm which identifies halo particles as those that have undergone shell crossing, providing a dynamical definition of halo boundaries that is independent of density. ORIGAMI identifies halo particles by tagging them according to whether they have crossed paths with their initial neighbors along 3 orthogonal axes. Additionally, particles that have crossed paths along 2, 1, or 0 axes roughly 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.

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