Back to Search
Start Over
Constraining the inner density slope of massive galaxy clusters.
- Source :
- Monthly Notices of the Royal Astronomical Society; Aug2020, Vol. 496 Issue 4, p4717-4733, 17p
- Publication Year :
- 2020
-
Abstract
- We determine the inner density profiles of massive galaxy clusters (M <subscript>200</subscript> > 5 × 10<superscript>14</superscript> M<subscript>⊙</subscript>) in the Cluster-EAGLE (C-EAGLE) hydrodynamic simulations, and investigate whether the dark matter density profiles can be correctly estimated from a combination of mock stellar kinematical and gravitational lensing data. From fitting mock stellar kinematics and lensing data generated from the simulations, we find that the inner density slopes of both the total and the dark matter mass distributions can be inferred reasonably well. We compare the density slopes of C-EAGLE clusters with those derived by Newman et al. for seven massive galaxy clusters in the local Universe. We find that the asymptotic best-fitting inner slopes of 'generalized' Navarro–Frenk–White (gNFW) profiles, γ<subscript>gNFW</subscript>, of the dark matter haloes of the C-EAGLE clusters are significantly steeper than those inferred by Newman et al. However, the mean mass-weighted dark matter density slopes of the simulated clusters are in good agreement with the Newman et al. estimates. We also find that the estimate of γ<subscript>gNFW</subscript> is very sensitive to the constraints from weak lensing measurements in the outer parts of the cluster and a bias can lead to an underestimate of γ<subscript>gNFW</subscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- GRAVITATIONAL lenses
DARK matter
DENSITY
GALAXY clusters
GALACTIC dynamics
KINEMATICS
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 496
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 144917631
- Full Text :
- https://doi.org/10.1093/mnras/staa1769