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Title: Splashback in accreting dark matter halos

Recent work has shown that density profiles in the outskirts of dark matter halos can become extremely steep over a narrow range of radius. This behavior is produced by splashback material on its first apocentric passage after accretion. We show that the location of this splashback feature may be understood quite simply, from first principles. We present a simple model, based on spherical collapse, that accurately predicts the location of splashback without any free parameters. The important quantities that determine the splashback radius are accretion rate and redshift.
Authors:
;  [1] ;  [2]
  1. Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)
  2. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)
Publication Date:
OSTI Identifier:
22375753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; NONLUMINOUS MATTER; RED SHIFT; SPHERICAL CONFIGURATION