Observing dynamical friction in galaxy clusters
TL;DR: In this article, the effects of dynamical friction in observed galaxy clusters were detected by stacking the number density profiles of galaxies around clusters using a simple toy model which reproduces the trends with halo properties observed in simulations.
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Abstract: We present a novel method to detect the effects of dynamical friction in observed galaxy clusters. Following accretion into clusters, massive satellite galaxies will backsplash to systematically smaller radii than less massive satellites, an effect that may be detected by stacking the number density profiles of galaxies around clusters. We show that this effect may be understood using a simple toy model which reproduces the trends with halo properties observed in simulations. We search for this effect using SDSS redMaPPer clusters with richness 10 -20) satellites at 99% confidence.
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Citations
Splashback Shells of Cold Dark Matter Halos
TL;DR: In this article, the authors present an algorithm to identify the "splashback shell" formed by these apocenters in individual simulated halos using only a single snapshot of the density field.
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Cluster-Galaxy Weak Lensing
TL;DR: Weak gravitational lensing of background galaxies provides a direct probe of the projected matter distribution in and around galaxy clusters as mentioned in this paper, with a focus on cluster mass profiles, the concentration-mass relation, the splashback radius, and implications from extensive mass calibration efforts for cluster cosmology.
Consistent Trees: Gravitationally Consistent Halo Catalogs and Merger Trees for Precision Cosmology
Peter Behroozi,Risa H. Wechsler,Hao-Yi Wu,Michael T. Busha,Anatoly Klypin,Joel R. Primack +5 more
- 01 Oct 2012
TL;DR: This algorithm is able to robustly measure the self-consistency of halo finders; it is the first to directly measure the uncertainties in halo positions, halo velocities, and the halo mass function for a given halo findinger based on consistency between snapshots in cosmological simulations.
13
Anisotropy and characteristic scales in halo density gradient profiles
TL;DR: In this paper , a large N -body simulation is used to study the characteristic scales in the density gradient in and around halos with masses ranging from 10 12 to 10 15 h − 1 M (cid:12) .
Dynamical friction due to fuzzy dark matter on satellites described by axisymmetric logarithmic potentials
TL;DR: In this paper , the authors present simulations of the dynamical friction on satellites traversing an initially uniform fuzzy dark matter halo and find that the wakes created by the passage of such satellites are qualitatively different from those generated by spherically symmetric ones.
4
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TL;DR: In this article, the authors performed the largest ever particle simulation of a Milky Way sized dark matter halo, and presented the most comprehensive convergence study for an individual dark mass halo carried out thus far.
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redMaPPer I: Algorithm and SDSS DR8 Catalog
Eli S. Rykoff,Eduardo Rozo,Michael T. Busha,Michael T. Busha,Carlos E. Cunha,Alexis Finoguenov,August E. Evrard,Jiangang Hao,Benjamin P. Koester,Alexie Leauthaud,Brian Nord,Marguerite Pierre,Rachel M. Reddick,Rachel M. Reddick,T. Sadibekova,Erin S. Sheldon,Risa H. Wechsler,Risa H. Wechsler +17 more
TL;DR: RedMaPPer as discussed by the authors is a new red sequence cluster finder designed to make optimal use of ongoing and near-future large photometric surveys, which can iteratively self-train the red sequence model based on a minimal spectroscopic training sample.