A better way to define dark matter haloes

Author:

García Rafael1,Salazar Edgar1,Rozo Eduardo1,Adhikari Susmita2,Aung Han3ORCID,Diemer Benedikt4ORCID,Nagai Daisuke5ORCID,Wolfe Brandon1

Affiliation:

1. Department of Physics, University of Arizona , Tucson, AZ 85721, USA

2. Department of Physics, Indian Institute of Science Education and Research , Homi Bhaba Road, Pashan, Pune 411008, India

3. Centre for Astrophysics and Planetary Science, Racah Institute of Physics, The Hebrew University , Jerusalem 91904, Israel

4. Department of Astronomy, University of Maryland , College Park, MD 20742, USA

5. Department of Physics, Yale University , New Haven, CT 06520, USA

Abstract

ABSTRACT Dark matter haloes have long been recognized as one of the fundamental building blocks of large-scale structure formation models. Despite their importance – or perhaps because of it! – halo definitions continue to evolve towards more physically motivated criteria. Here, we propose a new definition that is physically motivated, effectively unique, and parameter-free: ‘A dark matter halo is comprised of the collection of particles orbiting in their own self-generated potential’. This definition is enabled by the fact that, even with as few as ≈300 particles per halo, nearly every particle in the vicinity of a halo can be uniquely classified as either orbiting or infalling based on its dynamical history. For brevity, we refer to haloes selected in this way as physical haloes. We demonstrate that (1) the mass function of physical haloes is Press–Schechter, provided the critical threshold for collapse is allowed to vary slowly with peak height; and (2) the peak-background split prediction of the clustering amplitude of physical haloes is statistically consistent with the simulation data, with accuracy no worse than ≈5 per cent.

Funder

Department of Energy

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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