SIMBAD references

2019ApJ...874...33S - Astrophys. J., 874, 33-33 (2019/March-3)

Deriving galaxy cluster velocity anisotropy profiles from a joint analysis of dynamical and weak lensing data.


Abstract (from CDS):

We present an analytic approach to lift the mass-anisotropy degeneracy in clusters of galaxies by utilizing the line-of-sight velocity dispersion of clustered galaxies jointly with weak lensing inferred masses. More specifically, we solve the spherical Jeans equation by assuming a simple relation between the line-of-sight velocity dispersion and the radial velocity dispersion and recast the Jeans equation as a Bernoulli differential equation that has a well-known analytic solution. We first test our method in cosmological N-body simulations and then derive the anisotropy profiles for 35 archival data galaxy clusters with an average redshift of <zc>=0.25. The resulting profiles yield a weighted average global value of <β(0.2≤ R/R200≤ 1)>=0.35±0.28 (stat) ±0.15 (sys). This indicates that clustered galaxies tend to globally fall on radially anisotropic orbits. We note that this is the first attempt to derive velocity anisotropy profiles for a cluster sample of this size utilizing joint dynamical and weak lensing data.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): dark matter - galaxies: clusters: general - galaxies: halos - galaxies: kinematics and dynamics - methods: analytical

Simbad objects: 38

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